SOLUTION: Your piggy bank contains $19.75 in dimes and quarters. There are 100 coins in all. How many dimes are there?
A. 25
B. 30
C. 35
D. 40
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Question 560678: Your piggy bank contains $19.75 in dimes and quarters. There are 100 coins in all. How many dimes are there?
A. 25
B. 30
C. 35
D. 40
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
d+q = 100 ---> q = 100-d
0.1d+0.25q=19.75
10d+25q=1975
10d+25(100-d)=1975
10d+2500-25d=1975
-15d+2500=1975
-15d=1975-2500
-15d=-525
d=(-525)/(-15)
d=35
So there are 35 dimes.
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