acnagle/gsm8k-filtered huggingface dataset:
Sam shared a sum of money between his three cousins Sandra, Amy and Ruth in the ratio 2:1:3 respectively.

Question: If Amy got $50, how much did Sandra get?
Answer: Going by the ratio, for every 1 part that Amy gets, Sandra will get 2 parts
Since Amy got $50, Sandra will get 2*$50 = $<<2*50=100>>100
#### 100
John builds a model rocket that can travel 500 ft in the air. He builds a second rocket that can travel twice as high.

Question: What is the combined height of the two rockets?
Answer: The second rocket goes 500*2=<<500*2=1000>>1000 feet
So the total height is 500+1000=<<500+1000=1500>>1500 feet
#### 1500
Scarlet saved $80 to spend on jewelry. She bought a pair of earrings that cost $23. Then, she bought a necklace that cost $48.

Question: How much of her savings have left?
Answer: Scarlet spent $23 + $48 = $<<23+48=71>>71 for the jewelry.
So, She was left with $80 - $71 = $<<80-71=9>>9 on her savings.
#### 9
Anya has 4 times as many erasers as Andrea.

Question: If Andrea has 4 erasers, how many more erasers does Anya have than Andrea?
Answer: Anya has 4 x 4 = <<4*4=16>>16 erasers.
Thus, Anya has 16 - 4 = <<16-4=12>>12 more erasers than Andrea.
#### 12
Jamal bought 4 half dozen colored crayons at $2 per crayon.

Question: What was the total cost of the crayons that she bought?
Answer: Since a dozen has 12 items, a half dozen has 1/2*12=<<6=6>>6 items.
Since Jamal bought four half dozen colored crayons, he bought 4*6 = <<4*6=24>>24 colored crayons.
If each crayon's cost was $2, Jamal paid $2*24 = $<<2*24=48>>48 for all the crayons he bought.
#### 48
Harry is joining a marathon that's why he practices and varies his workouts from day to day. He ran 10 meters per hour on Monday. From Tuesday to Thursday he ran 50% faster than on Monday. Then on Friday, he ran 60% faster than he ran on Thursday.

Question: How fast did Harry run on Friday?
Answer: Harry ran 10 x 50/100 = <<10*50/100=5>>5 meters per hour faster on Tuesday to Wednesday.
So he ran 10 + 5 = <<10+5=15>>15 meters per hour from Tuesday to Thursday.
Then on Friday, he ran 15 x 60/100 = <<15*60/100=9>>9 meters per hour more.
Therefore, he ran 15 + 9 = <<15+9=24>>24 meters per hour on Friday.
#### 24
The length of a rectangle is four times its width. If the area is 100 m2.

Question: what is the length of the rectangle?
Answer: Let L be the length and W be the width of the rectangle.
Hence L = 4* W
We now use the area to write 80 = L * W
Substitute L by 4 W in the equation above 80 = 4*W × W = 4 W^2
Solve for W and find L
4 W^2 = 100
W^2 = 25, W = 5 and
L = 4*5 = <<4*5=20>>20 m
#### 20
A shop sold 29 bags of potatoes in the morning. In the afternoon, the shop sold 17 bags of potatoes.

Question: If each bag of potatoes weighs 7kg, how many kilograms of potatoes did the shop sell for the whole day?
Answer: They sold in the morning and afternoon for a total of 29+17 = <<29+17=46>>46 bags
Each bag weighs 7kg so 46 bags weigh 46*7kg = 322kg
#### 322
It's Yvette's turn to treat herself and her three best friends to a round of ice cream sundaes. Alicia orders the peanut butter sundae for $7.50. Brant orders the Royal banana split sundae for $10.00. Josh orders the death by chocolate sundae for $8.50 and Yvette orders the cherry jubilee sundae for $9.00. She leaves her waiter a 20% tip.

Question: How much will her final bill be?
Answer: Yvette spent 7.50+10+8.5+9 = $<<7.50+10+8.5+9=35.00>>35.00 on ice cream sundaes
Her bill comes to $35.00 and she leaves a 20% tip for the waiter so that's 35*.20 = $7.00
The bill was $35.00 and she added a $7.00 tip for a total of 35+7 = $<<35+7=42.00>>42.00
#### 42
Tom swims for 2 hours at a speed of 2 miles per hour. He then runs for half the time at 4 times the speed.

Question: How many miles did he cover?
Answer: He swam 2*2=<<2*2=4>>4 miles
He ran for 2/2=<<2/2=1>>1 hour
His running speed was 2*4=<<2*4=8>>8 mph
So he ran 8*1=<<8*1=8>>8 miles
So his total distance was 8+4=<<8+4=12>>12 miles
#### 12
Anna, Alison, and Jeff collect stamps. Anna had 37 stamps in her collection, Alison had 28 stamps in her collection, and Jeff had 31 stamps in his collection. Alison gave Anna half of her collection in exchange for a novel, and then Anna traded Jeff two bluebird stamps for one mountain stamp.

Question: How many stamps did Anna have in the end?
Answer: Alison gave Anna 1/2 * 28 = 28/2 = <<1/2*28=14>>14 stamps.
Adding Alison’s stamps to Anna’s collection means Anna has 14 + 37 = <<14+37=51>>51 stamps.
Then Anna traded Jeff 2 stamps, so she had 51 - 2 = <<51-2=49>>49 stamps.
Anna got 1 stamp back in the trade, so she had 49 + 1 = <<49+1=50>>50 stamps in the end.
#### 50
Luna, the poodle, is supposed to eat 2 cups of kibble every day. But Luna's master, Mary, and her husband, Frank, sometimes feed Luna too much kibble. One day, starting with a new, 12-cup bag of kibble, Mary gave Luna 1 cup of kibble in the morning and 1 cup of kibble in the evening, But on the same day, Frank also gave Luna 1 cup of kibble in the afternoon and twice as much in the late evening as he had given Luna in the afternoon.

Question: The next morning, how many cups of kibble will Mary find remaining in the bag?
Answer: Mary fed Luna 1+1=2 cups of kibble.
Frank fed Luna 1-cup plus twice 1-cup, or 1+2=3 cups of kibble.
In total, they fed Luna 2+3=<<2+3=5>>5 cups of kibble.
Thus, if the new bag held 12 cups of kibble, the next morning, 12-5=<<12-5=7>>7 cups of kibble remained in the bag.
#### 7
Faith went to a baking shop and bought flour that cost $5 and a cake stand that costs $28. She then gave the cashier two $20 bills and $3 in loose coins.

Question: How much change will she receive?
Answer: Faith must pay $28 + $5 = $<<28+5=33>>33 for the flour and cake stand.
Her two $20 bills amount to $20 x 2 = $<<20*2=40>>40.
So, she gave the cashier a total of $40 + $3 = $<<40+3=43>>43.
Hence, her change is $43 - $33 = $<<43-33=10>>10.
#### 10
Tom wants to make the world's largest dough ball. He needs 500 pounds of flour and he can buy 50-pound bags of flour for $20. He also needs 10 pounds of salt and salt cost $.2 a pound. He also spends $1000 promoting everything. He then sells tickets for $20 each and sells 500 tickets.

Question: How much money did he make?
Answer: He needs 500/50=<<500/50=10>>10 bags of flour
That cost 20*10=$<<20*10=200>>200
He needs 10*.2=$<<10*.2=2>>2 worth of salt
So everything cost 1000+200+2=$<<1000+200+2=1202>>1202
He makes 20*500=$<<20*500=10000>>10,000 selling tickets
So he makes a profit of 10000-1202=$<<10000-1202=8798>>8798
#### 8798
Susan wants to throw a party for her mom. She is planning on having 30 guests. For dinner she is making a recipe that makes 2 servings each. Each batch of the recipe calls for 4 potatoes and 1 teaspoon of salt. A potato costs $.10 and a container of salt costs $2 at the supermarket.

Question: If each container of salt has 5 teaspoons, how much money will Susan spend on food?
Answer: Susan needs to make 30/2=<<30/2=15>>15 batches of the recipe.
Therefore, she will need 15*4=<<15*4=60>>60 potatoes.
She will also need 1*15=<<1*15=15>>15 teaspoons of salt.
Thus she will have to buy 15/5 =<<15/5=3>>3 containers of salt.
Therefore, she will spend 60*$.1=$6 on potatoes and 3*$2=$6 on salt.
Thus, she will spend $6+$6=$<<6+6=12>>12 on food.
#### 12
Joan is at the grocery store. She has a total of $60 to spend. She is going to purchase 2 containers of hummus, which are $5 each. She is going to purchase chicken for $20, bacon for $10, and vegetables for $10. She wants to purchase apples which are $2 each.

Question: With her remaining money, how many apples can she purchase?
Answer: The total cost of the hummus is 2 * $5 = $<<2*5=10>>10
The total cost of the chicken, bacon, and vegetables is $20 + $10 + $10 = $<<20+10+10=40>>40
The remaining money she has is $60 - $10 - $40 = $<<60-10-40=10>>10
The amount of apples she can purchase is $10 / $2 = <<10/2=5>>5
#### 5
Lenny bought 20 boxes of pens. Each box contained  5 pens. She gave 40% of the pens to her close friends and one-fourth of what's left to her classmates.

Question: How many pens were left for Lenny?
Answer: Lenny has 20 x 5 = <<20*5=100>>100 pens.
She gave her close friends 100 x 40% = <<100*40*.01=40>>40 pens.
So, 100 - 40 = <<100-40=60>>60 pens were left.
Half of 60 is 60/4= <<60/4=15>>15 pens.
Thus, Lenny has 60 - 15 = <<60-15=45>>45 pens left.
#### 45
Josh has 18 yards of ribbon that is to be used equally to 6 gifts.

Question: If each gift will use 2 yards of ribbon, how many yards of ribbon will be left?
Answer: The 6 gifts will use 6 x 2 = <<6*2=12>>12 yards of ribbon.
So, 18 - 12 = <<18-12=6>>6 yards of ribbon will be left.
#### 6
A dietitian ate three-fourths of her lunch during her lunch break.

Question: If the total amount of food she had prepared for lunch had 40 calories, and the recommended calorie intake by the FDA is 25, how many more calories than the recommended amount did she eat?
Answer: A dietitian ate three-fourths of her lunch during her lunch break, containing 3/4*40=<<3/4*40=30>>30 calories.
If the recommended calorie intake by the FDA is 25, the dietitian ate 30-25=5 more calories than the recommended amount.
#### 5
Brenda picks 250 peaches. When she sorts through them, only 60% are fresh, and Brenda has to throw 15 away for being too small.

Question: How many peaches does Brenda have left?
Answer: First find how many of the peaches are fresh, which is 250 peaches * 60% = <<250*60*.01=150>>150 peaches.
Then, subtract the number Brenda throws away after the fresh count, which is 150 peaches - 15 peaches = <<150-15=135>>135 peaches.
#### 135
Megan is delivering meals on wheels. Out of her 30 clients, 7 need vegan meals, 8 need kosher meals, and three people need meals that are both vegan and kosher.

Question: How many meals does Megan deliver that are neither kosher nor vegan?
Answer: First, add the number of kosher meals to the number of vegan meals: 7 meals + 8 meals = <<7+8=15>>15 meals
Then subtract the three meals that are both kosher and vegan since they got counted twice: 15 meals - 3 meals = <<15-3=12>>12 meals
Finally, subtract that number from the total number of meals to find the number of meals that are neither kosher nor vegan: 30 meals - 12 meals = <<30-12=18>>18 meals
#### 18
There were 40 kids on Lake Pleasant. A fourth of the kids went tubing, but only half of the tubers went rafting.

Question: How many of the kids who joined the rafting excursion were also on the tubing excursion?
Answer: 40/4 = <<40/4=10>>10 kids went tubing.
10/2 = <<10/2=5>>5 kids went rafting and tubing.
#### 5
In her first term, Governor Sandoval gave twice as many commencement addresses as Governor Hawkins. Governor Sloan gave ten more commencement addresses than Governor Sandoval in the same amount of time.

Question: If Governor Sandoval gave 12 commencement addresses, how many commencement addresses did the three of them give altogether?
Answer: Since Governor Sandoval gave 12 commencement addresses, twice the number that Governor Hawkins gave, Governor Hawkins gave 12/2 = <<12/2=6>>6 commencement addresses.
The two of them gave 6+12 = <<6+12=18>>18 commencement addresses in total.
Governor Sloan gave ten more commencement addresses than Governor Sandoval, a total of 12+10 = <<12+10=22>>22 commencement addresses.
The three of them gave 22+18 = <<22+18=40>>40 commencement addresses.
#### 40
Bill put his french fries in the oven after it finished heating. The recommended time was 5 minutes for them to be fully cooked. He put them in for 45 seconds.

Question: How many seconds remained?
Answer: Each minute last 60 seconds, so that means for the fries to be fully cooked Bill needs to cook them for 5*60=<<5*60=300>>300 seconds
Since Bill had the fries in the oven for 45 seconds so far, that means they need to stay in the oven for another 300-45= <<300-45=255>>255 seconds.
#### 255
Based on a 2008 study, children 6–11 years old spend 45 minutes each day watching television.

Question: How many hours do these children watch television in 2 weeks if they are allowed to watch television 4 days a week?
Answer: The children watch a total of 45 x 4 = <<45*4=180>>180 minutes in a week.
In hours, this is equal to 180/60 = <<180/60=3>>3 hours a week.
Thus, these children watch 3 x 2 = <<3*2=6>>6 hours in two weeks.
#### 6
Jimmy decides to make sandwiches for a picnic. He makes 8 sandwiches in total, using two slices of bread each.

Question: How many packs of bread does he need to buy to make these sandwiches, assuming he starts with no bread and each pack has 4 slices of bread in it?
Answer: First, we need to determine how many slices of bread Jimmy will use to make the sandwiches. We determine this by performing 8*2=<<8*2=16>>16 slices of bread needed.
We then divide the number of slices needed by the number of slices per bread pack, performing 16/4=<<16/4=4>>4 packs of bread needed.
#### 4
Kylie picks apples for 3 hours. The first hour she picks 66 apples. The second hour she doubles her apple picking rate, and the third hour she picks a third of the apples picked in the first hour.

Question: How many apples did Kylie pick total?
Answer: First hour = 66 apples
Second hour = 66(2) = 132 apples
Third hour = 66(1/3) = 22 apples
Total number of apples picked 66+132+22=<<66+132+22=220>>220 apples
#### 220
Amoli and Anayet must travel 369 miles together. Amoli drove 42 miles an hour for 3 hours and Anayet drove at 61 miles an hour for 2 hours.

Question: How many miles do they still need to travel?
Answer: Amoli = 42 * 3 = <<42*3=126>>126 miles
Anayet = 61 * 2 = <<61*2=122>>122
Together = 126 + 122 = <<126+122=248>>248 miles
369 - 248 = <<369-248=121>>121 miles
They still have 121 miles to travel.
#### 121
A plumber is trying to decide which of three different jobs he should take to make the most money. The first job involves fixing three toilets and three sinks at an apartment complex. The second involves two toilets and five sinks at a different apartment complex. The third involves fixing one toilet, two showers and three sinks at a third apartment complex.

Question: If the plumber charges $30 to fix a sink, $40 to fix a shower and $50 to fix a toilet, what is the most money the plumber can earn if he can only choose one of these three jobs?
Answer: If the plumber chooses the first job, he would earn 3*50 + 3*30 = $<<3*50+3*30=240>>240.
If he chooses the second, he'd earn 2*50 + 5*30 = $<<2*50+5*30=250>>250.
If he chooses the third, he'd earn 50 + 2*40 + 3*30 = $<<50+2*40+3*30=220>>220.
Therefore, the most money he can earn from one of these jobs is $<<250=250>>250.
#### 250
Three buckets are holding different fruits.

Question: Bucket A has 4 more pieces of fruit than bucket B while bucket B has 3 more pieces of fruit than bucket C. If bucket C has 9 pieces of fruit, how many pieces of fruit are in all 3 buckets?
Answer: Bucket B has 3 more fruits than C (which has 9 fruits) for a total of 9+3 = <<3+9=12>>12 fruits
Bucket A has 4 more fruits than B (which has 12 fruits) for a total of 12+4 = <<4+12=16>>16 fruits
All three buckets have a total of 9+12+16 = <<9+12+16=37>>37 fruits
#### 37
Amber worked for 12 hours last weekend. Armand worked one-third as long and Ella worked twice as long.

Question: How many hours did the 3 people work in total?
Answer: Armand = (1/3) * 12 = <<(1/3)*12=4>>4 hours
Ella = 2 * 12 = <<2*12=24>>24 hours
Total hours = 12 + 4 + 24 = <<12+4+24=40>>40 hours
They worked a total of 40 hours.
#### 40
Mara and Riley went to a carnival, Mara rode the bumper car two times, Riley rode the space shuttle four times, and they both rode the Ferris wheel three times.

Question: If a ticket for a bumper car cost $2, a ticket for a space shuttle cost $4, and a ticket for a Ferris wheel cost $5, how much money did they spend?
Answer: Mara spent $2 x 2 = $<<2*2=4>>4 for riding the bumper car two times.
Riley spent $4 x 4 = $<<4*4=16>>16 for riding the space shuttle 4 times.
They spent $5 x 3 = $<<5*3=15>>15 each riding the Ferris wheel 3 times.
So, they spent a total of $15 x 2= $<<15*2=30>>30 riding the Ferris wheel.
Therefore the total amount they spent at the carnival is $4 + $16 + $30 = $<<4+16+30=50>>50.
#### 50
James buys $3000 worth of stuff from Amazon. He has to return a TV that cost $700 and a bike that cost $500. He also sells another bike that cost 20% more than the bike he returned for 80% of what he bought it for. He then buys a toaster for $100.

Question: How much is he out of pocket for everything?
Answer: The items he returned were valued at $700 + $500 = $<<700+500=1200>>1200
So far he is out 3000-1200 = <<3000-1200=1800>>1800 after recouping 1200.
An item that is 20% more expensive cost 1 + .2 = 1.2 times as much as the item
So that means the bike he sold cost $500 * 1.2 = $<<500*1.2=600>>600
He sold it for $600 * .8 = $<<600*.8=480>>480
From the bike that he had bought for 600, he was out 600-480 =<<600-480=120>>120
So far he is out 1800+120 = <<1800+120=1920>>1920
If he also bought a toaster worth 100, he was out 1920+100 = <<1920+100=2020>>2020
#### 2020
The flowers cost $9, the clay pot costs $20 more than the flower, and the bag of soil costs $2 less than the flower.

Question: How much does it cost to plant the flowers?
Answer: The clay pot costs $20 + $9 = $<<20+9=29>>29.
The bag of soil costs $9 - $2 = $<<9-2=7>>7.
The cost to plant the flowers is $9 + $29 + $7 = $<<9+29+7=45>>45.
#### 45
During one hour, Tom can read 12 pages of a book.

Question: How many pages would he be able to read during 2 hours if he could increase his reading speed by a factor of 3?
Answer: If Tom could triple his reading speed, he could read 12 * 3 = <<12*3=36>>36 pages of a book in one hour.
Therefore, during two hours he could read 36 * 2 = <<36*2=72>>72 pages.
#### 72
I went to the music shop and there were CDs of The Life Journey for $100, A Day a Life for $50, and When You Rescind for $85 on display.

Question: If I bought 3 of each CD to share with my friends, what's the total amount of money I spent in the shop?
Answer: The total cost of The Life Journey is 3 × $100 = $<<3*100=300>>300.
The total cost of When You Rescind is 3 × $85 = $<<3*85=255>>255.
The total cost of A Day a Life is 3 × $50 = $<<3*50=150>>150.
The total cost for all the CDs is $150 + $255 + $300 = $<<150+255+300=705>>705.
#### 705
Melissa wants to make some dresses to sell at the upcoming festival. She has 56 square meters of fabric to make them. She knows that each dress takes 4 square meters of fabric and 3 hours to make.

Question: How many hours does she have to work?
Answer: Each dress takes 4 square meters of fabric to make, so the number of dresses she can make will be 56/4 = <<56/4=14>>14 dresses.
Each dress takes 3 hours to make, thus she will have to work 14 dresses x 3 hours/dress = <<14*3=42>>42 hours.
#### 42
A zoo has 8 parrots. It 3 times the number of snakes than parrots and 2 times the number of monkeys than snakes. The number of elephants is half the number of parrots and snakes added up, and there are 3 fewer zebras than elephants.

Question: What is the difference in number between the zebras and the monkeys?
Answer: The zoo has 8 x 3 = <<8*3=24>>24 snakes.
It has 24 x 2 = <<24*2=48>>48 monkeys.
The number of parrots and snakes added up is 8 + 24 = <<8+24=32>>32
There are 32/2 = <<32/2=16>>16 elephants.
There are 16 - 3 = <<16-3=13>>13 zebras.
The difference between zebras and monkeys is 48 - 13 = <<48-13=35>>35
#### 35
The county fair was hosting a pumpkin contest to see who could grow the biggest pumpkin in pounds. Brad entered his pumpkin with a weight of 54 pounds. Jessica's was half the weight of Brad's. Betty's pumpkin weight 4 times the amount of Jessica's pumpkin.

Question: What is the difference between the heaviest and lightest pumpkin in  pounds?
Answer: Jessica's pumpkin weighs half the weight of Brad's 54-pound pumpkin so 54/2 = <<54/2=27>>27 pounds
Betty's pumpkin weighs 4 times the amount of Jessica's 27-pound pumpkin so it weighs 4*27 = <<4*27=108>>108
Betty has the heaviest pumpkin at 108 pounds while Jessica's is the lowest at 27 pounds so the difference is 108-27 =<<108-27=81>>81 pounds
#### 81
On a particular week, Fatima's restaurant served 25 people food and drinks, and 3/5 of that number came to buy coffee.

Question: How many people did not buy coffee in the restaurant?
Answer: The number of customers who were served coffee in the restaurant is 3/5*25 = <<3/5*25=15>>15
If the total number of customers who came to the restaurant was 25, then 25-15 = <<25-15=10>>10 customers did not buy coffee
#### 10
John writes 3 stories every week. Each short story is 50 pages. He also writes a novel that is 1200 pages each year. Each sheet of paper can hold 2 pages.

Question: Over 12 weeks, how many reams of paper does he need to buy if a ream contains 500 sheets?
Answer: He writes 3*50=<<3*50=150>>150 pages a week
That means he writes 150*52=<<150*52=7800>>7800 pages of short stories a year
So he writes 7800+1200=<<7800+1200=9000>>9000 pages a year
So he needs 9000/2=<<9000/2=4500>>4500 sheets of paper
That means he needs 4500/500=<<4500/500=9>>9 reams of paper
#### 3
Eden, Mary and Iris gather sand to fill their sandbox. Eden carried 4 buckets of sand. Mary carried 3 more buckets of sand than Eden. Iris carried 1 less bucket of sand than Mary.

Question: If each bucket contains 2 pounds of sand, how many pounds of sand did they collect in total?
Answer: Mary carried 4 + 3 = <<4+3=7>>7 buckets of sand.
Iris carried 7 – 1 = <<7-1=6>>6 buckets of sand.
All together, they carried 4 + 7 + 6 = <<4+7+6=17>>17 buckets of sand.
The sand weighed a total of 17 * 2 = <<17*2=34>>34 pounds.
#### 34
Karen has 32 quarters in her piggy bank. Her older brother Christopher has 64 quarters in his piggy bank.

Question: How much more money does Christopher have?
Answer: Christopher has 64 quarters so he has 64*.25 = $<<64*.25=16.00>>16.00
Karen has 32 quarters so she has 32*.25 = $<<32*.25=8.00>>8.00
If Christopher has $16.00 and Karen has $8.00 then Christopher has 16-8 = $<<16-8=8.00>>8.00 more than Karen
#### 8
James hurt himself exercising. The pain subsided after 3 days, but he knew that the injury would take at least 5 times that long to fully heal. After that, he wanted to wait another 3 days before he started working out again.

Question: If he wants to wait 3 weeks after that to start lifting heavy again, how long until he can lift heavy again?
Answer: The injury would be fully healed after 3*5=<<3*5=15>>15 days
So he would start exercising again in 15+3=<<15+3=18>>18 days
He would then wait for 3*7=<<3*7=21>>21 more days to start lifting heavy again
That means he needs to wait 18+21=<<18+21=39>>39 days
#### 39
Zion made a triangular-shaped house of cards with the base having a measurement of 40 centimeters and a height of 20 centimeters.

Question: If two of his friends also built similar shaped houses, what's the total area of the triangular houses that Zion and his friends made (the area of a triangle is 1/2 * width * height)?
Answer: Since the area of a triangle is given by 1/2 base*height, the area of the triangular-shaped house of cards that Zion made is 1/2*40*20 = <<1/2*40*20=400>>400 square centimeters.
If two of his friend also built similar shaped houses, the total area of their triangular-shaped house of cards is 400+400=<<400+400=800>>800 square centimeters.
Together with Zion, they all built triangular-shaped houses of cards with a combined area of 800+400=<<800+400=1200>>1200 square centimeters.
#### 1200
Of the 90 people on William's bus, 3/5 were Dutch. Of the 1/2 of the Dutch who were also American, 1/3 got window seats.

Question: What's the number of Dutch Americans who sat at the windows?
Answer: On the bus, the number of Dutch people was 3/5 of the total number, a total of 3/5*90 = <<3/5*90=54>>54 people.
Out of the 54 people who were Dutch, 1/2 were Dutch Americans, a total of 1/2*54 = <<1/2*54=27>>27 people.
If 1/3 of the passengers on the bus identifying as Dutch Americans sat at the windows, their number is 1/3*27 = <<1/3*27=9>>9
#### 9