Q: Joy can read 8 pages of a book in 20 minutes. How many hours will it take her to read 120 pages?
A: In one hour, there are 3 sets of 20 minutes. So, Joy can read 8 x 3 = 24 pages in an hour. It will take her 120 / 24 = 5 hours to read 120 pages. The answer is 5.

Q: Brady will make $450 more in a year than Dwayne. If Dwayne makes $1,500 in a year, how much will Brady and Dwayne make combined in a year?
A: Brady will make $450 + $1500 = $1950. Combined, Brady and Dwayne will make $1950 + $1500 = $3450 in a year. The answer is 3450.

Q: Mac loves the shape of quarters and is willing to trade money for them, even if he loses value. He tells his brother that he will trade him 3 dimes for a quarter or 7 nickels. He trades for 20 quarters with dimes and 20 quarters with nickels. How many dollars did Mac lose?
A:
Three dimes is equal to $.3 because 3 x .1 = .3. Seven nickels is equal to $.35 because 7 x .05 = .35. Each time he trades with dimes he lose $.05 because .3 - .25 = .05. Each time he traded with nickels he lost $.1 because .35 - .25 = .1. He lost $1 from trading with dimes because 20 x .05 = 1. He lost $2 from trading with nickels because 20 x .1 = 2. He lost $3 total because 1 + 2 = 3. The answer is 3.