Jessica had 15 coins in her piggy bank, all dimes and quarters. If they totaled $3.60, how many were dimes and how many were quarters?

Question

math is hard.

Answer 1

Let d - the number of dimes

Let q = the number of quarters

d + q = 15      q = 15 - d

.10d + .25q = 3.60

.10d + .25(15 - d) = 3.60

.10d + 3.75 - .25d = 3.60

-.15d = -.15

d = 1

q = 15 - 1 = 14