Question 64677
Let x=number of quarters
then 136-x=number of dimes

To make life easier for me, I choose to deal in pennies.

25x is the amount of money in quarters.
10(136-x) is the amount of money in dimes.

Now we are told that the amount of money in quarters (25x) plus the amount of money in dimes 10(136-x) equals $28  or 2800 pennies. Thus, our equation to solve is:

25x+10(136-x)=2800 simplifying we get:
25x+1360-10x=2800 collecting like terms, we have:

25x-10x=2800-1360
15x=1440
x=96 quarters
136-96=40 dimes

ck
10(40)+96(25)=2800
400+2400=2800
2800=2800

Hope this helps.  Happy holidays.----ptaylor