Question 1125424
A student makes a ​$10.50 purchase at the bookstore with a​ $20 bill. The store has no bills and gives the change in quarters and​ fifty-cent pieces. There are 30 coins in all. How many of each kind are​ there? 
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{{{20.00-10.50=9.50}}}--------the change back needed from cashier


q quarters
h half-dollar pieces

{{{system(q+h=30,0.25q+0.5h=9.5)}}}


{{{q+2h=38}}}
{{{and}}}
{{{q+h=30}}}


{{{highlight(h=8)}}}-----------fifty-cent pieces
{{{highlight(22)}}}-----------quarters