Jamie has 4 quarters and some dimes in his pocket. The total value of the coins is $2.30. How many dimes does he have in his pocket?
Out of a dollar a quarter is .25 of its total.
4 quarters = .25 * 4 = $1
2.30-1.00 = 1.30
Dimes are .10 of its total.
1.30/.10 = 13