Question 1000302
x = number of dimes
40 - x = number of quarters   {there are 40 total coins in the bag}


10x + 25(40 - x) = 715  {number of coins times value of coin equals total value}
10x + 1000 - 25x = 715  {used distributive property}
-15x + 1000 = 715   {combined like terms}
-15x = -285   {subtracted 1000 from each side}
x = 19   {divided each side by -15}


There are 19 dimes.
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