Question 1123114
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90 ​coins, all of which are either quarters or nickels. The total value of the coins in the jar is ​$13.70. How many of each type of coin do they​ have?
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q+n=90
n=90-q


{{{25q+5(90-q)=1370}}}
{{{25q+450-5q=1370}}}
{{{20q=1370-450}}}
{{{20q=920}}}
{{{highlight(q=46)}}}-------quarters


{{{highlight(44)}}}--------nickels


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check:
{{{44*0.05+46*0.25}}}
{{{13.7}}}