Question 1203239
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stella has 63 coins .the coins are a mixture of quarters and dimes .she has a total of $10.80 . how many quarters and how many dimes does stella have

Let number of quarters she has, be Q
Then number of dimes she has = 63 - Q
We then get: .25Q + .1(63 - Q) = 10.8
              .25Q + 6.3 - .1Q = 10.8
                    .25Q - .1Q = 10.8 - 6.3
                          .15Q = 4.5
     Number of quarters, or {{{highlight_green(matrix(1,7, Q, "=", 4.5/.15, "=", 450/15, "=", highlight(30)))}}}  

You should now be able to determine the number of dimes.</pre>