Question 381970
to solve these kind of questions you need to set up  a system and solve it. when you have on of these problems with amount of money and # of the pices, put the money together and the #'s together! then put .10 for a dime and .25 for a quarter.

.10d+.25q=$2.55.............(the first equation)
d= 8+q......................(since she had 8 more of the quarters than the
.............................dimes; the second equation)

now you solve the easiest way for these questions is substitution!

 .10*(8+q)+.25q= 2.55
 .8+ .10q+.25q= 2.55
 .8+ .35q= 2.55
-.8........-.8

.35q/.35 = 1.75/.35

q=5 :) and that's how many quarters she has! & if you want to know how many dimes just plug the # of quarters back in and you can find it!!!! :D

you r welcome :) glade i could help!