[Question]Each bank teller has 10 rolls of coins. Each roll has 25 coins. How many coins do four bank tellers have in all?
[Answer]Each bank teller has 10 x 25 = 250 coins. Thus, four bank tellers have 250 x 4 = 1000 coins. The answer is 1000.
Q: Peter and Kristin are to read 20 fantasy novels each in a week. Peter can read three times as fast as Kristin. If Peter reads one book in 18 hours, how long will Kristin read half of her books?
A: Since Peter reads three times as fast as Kristin, Kristin will take 18 * 3 = 54 hours to read one book. Kristin reads half of her books, a total of 20 / 2 = 10 books. The time Kristin will take to read half of her books is 10 * 54 = 540. The answer is 540.
Question: Bryce is bringing in doughnuts for his class. There are 25 students in his class, 10 kids want chocolate doughnuts and 15 want glazed doughnuts. The chocolate doughnuts cost $2 each and the glazed doughnuts cost $1 each. How much is the total cost for doughnuts?
Answer: The chocolate doughnuts cost 10 * $2 = $20. The glazed doughnuts cost 15 * $1 = $15. The total cost for the doughnuts is $20 + $15 = $35. The answer is 35.
[Question]Faye had $20. Today, her mother gave her twice as much as her money. If she bought ten cupcakes at $1.50 each and five boxes of cookies at $3 per box, how much money did she have left?
[Answer]Faye's mother gave her 2 x $20 = $40. So, Faye had a total of $20 + $40 = $60. Ten cupcakes cost 10 x $1.50 = $15. Five boxes of cookies cost 5 x $3 = $15. Thus, Faye spent $15 + $15 = $30. Therefore, Faye has $60 - $30 = $30 left. The answer is 30.
Q: There are 10 students in a class. The average age of 9 of them is 8 years. By how many years will this average increase if the tenth student is (quite strangely) 28 years old?
A: 9 students have an average age of 8 years so the sum of their ages is 9 * 8 = 72 years. A tenth student who is 28 years old will make the sum 72 + 28 = 100 years. The new average age will be 100 / 10 = 10 years. This is 10 - 8 = 2 years higher than the previous average. The answer is 2.
Question: Jackie can do 5 push-ups in 10 seconds. How many push-ups can she do in one minute if she takes two 8-second breaks?
Answer:
There are 60 seconds per minute, so Jackie’s push - up routine takes 1 * 60 = 60 seconds. Her breaks last 2 * 8 = 16 seconds. She does push - ups for 60 - 16 = 44 seconds. She can do a push - up in 10 / 5 = 2 seconds. Therefore, Jackie can do 44 / 2 = 22 push - ups in one minute with breaks. The answer is 22.