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A student makes a 9.25 purchase at the bookstore with a 20 bill the store has no bills and gives the change in quarters and fifty-cent prices there are 30 coins in all how many of each kind are there?
Wiki User
∙ 14y ago
the answer is found by using a system of equations. the first says that you need two types of coins that add up to 30.
x+y=30
the second is an equation denoting that the values of coins x and y must add up to 10.75 (the change)
0.25x+0.5y=10.75
we solve this system:
x+ y=30
.25x+.5y=10.75
Answer 13 half dollars and 17 quarters
Note! There may be more answers!!
Wiki User
∙ 14y ago
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