SOLUTION: The cost of a pencil is 25 cents more than the cost of a eraser. if the cost of 8 pencils and 10 eraser is $12.80, find the cost of each.

Algebra ->  Customizable Word Problem Solvers  -> Unit conversion -> SOLUTION: The cost of a pencil is 25 cents more than the cost of a eraser. if the cost of 8 pencils and 10 eraser is $12.80, find the cost of each.      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 960241: The cost of a pencil is 25 cents more than the cost of a eraser. if the cost of 8 pencils and 10 eraser is $12.80, find the cost of each.
Found 3 solutions by CubeyThePenguin, MathTherapy, ewatrrr:
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
p = cost of a pencil
e = cost of an eraser

p = e + 0.25
8p + 10e = 12.80

Plug in the first equation into the second.

8(e + 0.25) + 10e = 12.80
18e = 12.78
e = 0.71

An eraser costs 71 cents and a pencil costs 96 cents.

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

The cost of a pencil is 25 cents more than the cost of a eraser. if the cost of 8 pencils and 10 eraser is $12.80, find the cost of each.
The person is WRONG, again!

Correct answers:

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

 8(x+25) + 10x = 1280   |cents makes sense
       18x = 1080
         x = 60 cents, eraser cost   & pencil costs 85 cents    60%2B25