Human: 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? Assistant:
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