Posted by Sadie on .
Lee has 35 dimes and quarters that total $5.00. Solve the system of equations to find how many dimes and how many quarters he has.
Please show your work thanks
multiply the second by 20 to get
Substitute d=35-q from (1)
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.