SOLUTION:
sarah has a total of $4.10 in dimes and quarters. Altogether there are 29 coins. how many dimes and quarters does she have?
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Question 706609:
sarah has a total of $4.10 in dimes and quarters. Altogether there are 29 coins. how many dimes and quarters does she have?
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
Q+D=29
Q=29-D
.25Q+.10D=4.10
.25(29-D)+.10D=4.10
7.25-.25D+10D=4.10
-.15D=4.10-7.25
-.15D=-3.15
D=-3.15/-.15
D=21 NUMBER OF DIMES.
Q=29-21=8 QUARTERS.
PROOF:
.25*8+.10*21=4.10
2.00+2.10=4.10
4.10=4.10
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