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January 30, 2015

Posted by **Sadie** on Saturday, February 25, 2012 at 9:10pm.

d+q=35

0.1d+0.25q=5

Please show your work thanks

- Math -
**MathMate**, Saturday, February 25, 2012 at 9:35pmd+q=35 ....(1)

0.1d+0.25q=5

multiply the second by 20 to get

2d+5q=100 ....(2)

Substitute d=35-q from (1)

70-2q+5q=100

3q=30

q=10

d=25

Another way to calculate (mentally) is as follows:

Assume all dimes: 35*0.1=3.5

There is $1.50 available to change quarters for dimes at 15 cents a piece. So we change 10 of them to get 10 quarters and (35-10)=25 dimes.

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