Question

A box contains $7.80 in nickels, dimes, and quarters. There are 46 coins in all, and the sum of the numbers of nickels and dimes is 2 less than the number of quarters. How many coins of each kind are there?

Answer 1

5n+10d+25q = 780
n+d+q = 46
n+d = q-2

Now just solve.

Answer 2

56456