Q: It takes Matt 2 minutes per problem to do his math homework with a calculator and 5 minutes per problem without a calculator. If Matt's assignment has 20 problems, how much time will using a calculator save?
A: First find the time difference per problem: 5 minutes / problem - 2 minutes / problem = 3 minutes / problem. Then multiply that number by the number of problems to find the total time difference: 3 minutes / problem * 20 problems = 60 minutes. The answer is 60.
Question: Bobby wanted pancakes for breakfast. The recipe on the box makes 21 pancakes. While he ate 5 pancakes, his dog jumped up and was able to eat 7 before being caught. How many pancakes does Bobby have left?
Answer: Bobby ate 5 pancakes and his dog ate 7 so 5 + 7 = 12. The recipe makes 21 pancakes and 12 were eaten so 21 - 12 = 9 pancakes were left. The answer is 9.
[Question]A new book sold 15 copies at the bookstore on Wednesday. On Thursday the book sold three times that many copies. On Friday the book sold one-fifth the number of copies it did on Thursday. How many copies of the book did the bookstore sell by Friday?
[Answer]On Thursday 15 * 3 = 45 books were sold. On Friday 45 / 5 = 9 books were sold. Adding up all three days 15 + 45 + 9 = 69 books were sold by Friday. The answer is 69.
Q: Marissa has 4.5 feet of ribbon that she wants to use to tie some boxes. If 1 foot of ribbon is left after Marissa uses 0.7 feet of ribbon to tie each box, find out how many boxes she tied?
A: Marissa used a total of 4.5 - 1 = 3.5 feet of ribbon to the boxes. Thus, there were 3.5 / 0.7 = 5 boxes. The answer is 5.
Question: Bea and Dawn both have a lemonade stand. Bea sells her lemonade at 25 cents while Dawn sells hers at 28 cents. If Bea sold 10 glasses and Dawn sold 8 glasses, how much more money (in cents) did Bea earn than Dawn?
Answer: Bea's sales amount to $0.25 / glass x 10 glasses = 250 cents. Dawn's sales amount to $0.28 / glass x 8 glasses = 224 cents. So, Bea earned $2.50 - $2.24 = 26 cents more than Dawn. The answer is 26.
Q: Sam is serving spaghetti and meatballs for dinner. The pasta costs $1.00 per box, a jar of sauce is $2.00 and 1 pound of meatballs is $5.00. He wants to stretch this meal into 8 servings. How much does each serving cost?
A:
The pasta is $1.00, the sauce is $2.00 and the meat is $5.00 for a total of 1 + 2 + 5 = $8.00. He wants to stretch this meal into 8 servings so each serving will cost 8 / 8 = $1.00. The answer is 1.