Jennie has 18 coins that are all either quarters or dimes. The total value of her money is $3.20. Write one equation for the total number of coins and a second equation for the total value.

Answer 1

Let Q = the number of quarters Jennie has.

Let D= the number of dimes Jennie has.

Q + D =18

$.25*Q + $.10*D = $3.20.