Answer the following question, with explanation first.
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?

3
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.

.

So, the final answer is 3