Question 1030435
Call the number of quarters he has, q.
Thus the number of dimes he has is 2q.
Using the value of each, we write
25q + 10(2q) = 315 (we work in cents)
Now solve for q...we get
25q + 20q = 315
45q = 315
q = 7 quarters which means
2q = 14 dimes