SOLUTION: How can I make $5.11 out of 31 coins? I can only use pennies and quarters

Question 157929: How can I make $5.11 out of 31 coins? I can only use pennies and quarters
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let's call the pennies P and quarter Q.
Each penny is worth $0.01 and each quarter $0.25.
Total number of coins is 31.
1.P+Q=31
Total value of coins is $5.11.
2.$0.01*P+$0.25*Q=$5.11
Let's multiply both sides of eq. 2 by 100 to get rid of decimals.
2.
From eq. 2,
2.

Substitute this expression into eq. 1 and solve for Q.
1.

from above

11 pennies abd 20 quarters.
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