Question 204998
A student makes a $9.75 purchase at the bookstore with a $20 bill. the store has no bills and gives the change in quarters and fifty cent pieces. their are 30 coins in all. how many of each kind are there? How many quarters are there in the change?
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The change is $10.25.
q = quarters
h = half-dollars
q + h = 30 (30 coins) --> q = 30-h
25q + 50h = 1025
Sub for q
25(30-h) + 50h = 1025
750-25h + 50h = 1025
25h = 275
h = 11
q = 19