Question 411502
I have a jar containing 88 coins, all of which are either quarters or nickles.  the value is $13. how many of each type of coin do I have?
Sol'n:
let q - the total # of quarters
n - the total # of nickels

q+n=88 ---(1)
0.25q+0.05n=13 ---(2)

solving two equations, either by elimination or by substitution
q=43, n=45
thus,
quarters are 43 pcs & nickels are 45 pcs. ---answer