[Question]Kat gets a 95% on her first math test and an 80% on her second math test. If she wants an average grade of at least 90% in her math class, what does she need to get on her third final math test?
[Answer]Let x = the percent needed on her third math test. (95 + 80 + x) / 3 = 90. (95 + 80 + x) = 270. x = 270 - 95 - 80. x = 95. The answer is 95.
Q: Mona bikes 30 miles each week to stay fit. This week, she biked on Monday, Wednesday, and Saturday. On Wednesday, she biked 12 miles. On Saturday, she biked twice as far as on Monday. How many miles did she bike on Monday?
A: Let M be the number of miles Mona biked on Monday. Thus, Mona biked 2M miles on Saturday. In all, Mona biked M + 2M + 12 = 30 miles. Thus, on Monday and Saturday, she biked M + 2M = 3M = 30 - 12 = 18 miles. Therefore, on Monday, Mona biked M = 18 / 3 = 6 miles. The answer is 6.
Question: John has 3 children. He and his wife are supposed to buy notebooks for their sons but they couldn't agree on how many to buy. So John bought 2 notebooks for each of his children and John's wife bought 5 notebooks for each of them. How many notebooks did they buy in total for their children?
Answer: John bought 2 notebooks for his 3 children: 2 notebooks / child x 3 children = 6 notebooks. The father bought 6 notebooks. John's wife bought 5 notebooks for their three children: 5 notebooks / child x 3 children = 15 notebooks. The mother bought 15 notebooks. Now, the total number of notebooks is 6 notebooks + 15 notebooks = 21 notebooks. The answer is 21.
[Question]Pat is buying supplies for S'mores. He and his friends will each eat 3 S'mores. There are 8 of them in total. It costs $3 in supplies to make 4 S'mores. How much will it cost to buy all the supplies?
[Answer]They are making 24 S'mores because 8 x 3 = 24. Each S'more costs $.75 to make because 3 / 4 = .75. It will cost $18 to make them all because 24 x .75 = 18. The answer is 18.
Q: There were 50 racers in a bicycle charity race at the beginning of the race. After 20 minutes, 30 more racers joined the race. The total number of racers doubled after another 30 minutes. If at the end of the race only 130 people finished the race, what's the total number of people who dropped before finishing the race?
A: At the start, there were 50 racers, who were joined by 30 more racers, thus 50 + 30 = 80 racers. After 30 more minutes, the number of racers doubled, totaling 80 * 2 = 160 racers. If the number of racers who finished is 130, the 160 - 130 = 30 racers dropped before finishing. The answer is 30.
Question: Carl has a jar full of marbles. He takes out 12 marbles to play a game with, but he accidentally drops them and 1/2 the marbles get lost. So Carl takes out 10 more marbles. While he is playing his game his mother comes home with another bag of marbles for him, which has 25 marbles in it. If Carl can't find his lost marbles, then how many marbles is he going to put in the jar after he plays his game, from both his original marbles and the new ones?
Answer:
Carl starts with 12 marbles to play with but loses 1 / 2, 12 / 2 = 6 marbles Carl didn't lose. Carl takes out 10 more marbles, 6 + 10 = 16 marbles. Then Carl's mother brings him 25 new marbles to add to the 16 he has out of his jar, 25 + 16 = 41 marbles that Carl is going to put in his jar after he plays his marbles game. The answer is 41.