Answer this question:Ruel has four books of 10 stamps and six books of 15 stamps. How many stamps does Ruel have?
Ruel has a total of 4 x 10 = 40 stamps from the four books. He also has 6 x 15 = 90 stamps from the six books. Therefore, he has a total of 40 + 90 = 130 stamps.
The answer is 130.

Answer this question:John has a very inefficient toilet that uses 5 gallons of water per flush and his household flushed 15 times per day. He replaced it with a toilet that uses 80% less water per flush. How much water did John save in June?
He used to use 5 * 15 = 75 gallons of water per day. This means he used 75 * 30 = 2250 gallons a month. His new toilet uses 5 * .8 = 4 gallons less water per flush. So, it only uses 5 - 4 = 1 gallon per flush. That means he uses 1 * 15 = 15 gallons per day. All in all, it accounts for a total usage of 15 * 30 = 450 gallons. So, he saved 2250 - 450 = 1800 gallons per month.
The answer is 1800.

Answer this question:Gretchen is a scuba diver. She likes to hunt for treasure on the ocean's floor, but when she finds something to keep, she must carry it back to the surface of the water to give it to her shipmate on the boat. She can only carry 3 objects at a time while she swims underwater. If she finds 17 objects underwater, what is the fewest number of trips to the surface of the water she must take to carry all 17 objects to the boat?
To carry 17 objects, three at a time, it takes 17 / 3 = 5 and 2 / 3 loads. This calculation means that she takes 5 trips carrying 3 objects per trip, and then she takes one additional trip carrying only two objects. Thus, in reality, she takes 5 + 1 = 6 trips to the surface.
The answer is 6.

Answer this question:Venny spent $15000 on a used car which cost 40% of the original price. What was the original price of the car?
Let x be the original price of the car. Then 40% * x = $15000. Thus x = $15000 / 0.4 = $37500.
The answer is 37500.