Question 1002940
Mentally, we see that there are 4 dimes and 1 quarter.


Algebraically,


d = number of dimes
q = number of quarters


10d + 25q = 65
d + q = 5


Multiply the second equation by 10.


10d + 25q = 65
-(10d + 10q = 50)
--------------------
15q = 15
q = 1


Like before, we have 4 dimes and 1 quarter.