Question 142918
Sure!
First, Let's assigned "x" for wirebound notebk, and "y' for college notebk, and we know the total is 50. Equating the fact, "x+y=50" right? -------- eqn 1
Next, $2.50 of each wirebound were sold PLUS $2.30 each of college also sold and total to $118.60. Equating that fact,
$2.50(x) + $2.30(y) = $118.60, isn't it?  -----------  eqn 2
Go back eqn 1 we get "y=50-x" and substitute this value of y in eqn 2. Continuing,
$2.50(x) + $2.30(50-x) = $118.60
$2.50(x) + $115 -$2.30(x) = $118.60
$0.20(x) = $118.60-$115
$0.20(x) = $ $3.60
x= 18,  total pieces for wirebound notebook
in eqn 1 we get y=50-18= 32 pieces, total for college ruled notebk
In doubt? Go back eqn 2,
$2.50(18) + $2.30(32) =$118.60
$45 + $73.60 = $118.60
$118.60 = $118.60, cool!
Thank you,
Jojo