Question 988424
d + q = 40
0.1d + 0.25q = 4.90


Use elimination by multiplying the second equation by 4 and subtracting it from the first equation.


d + q = 40
-(0.4d + q = 19.6)
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0.6d = 20.4
d = 34


There are 34 dimes and 6 quarters.