Systems of equations : word problems

Question

Need to know set up of the equation and answer.

You purchased office supplies for your business. Plain copy paper is $4.50 a pack and bright paper costs $7 a pack. If you purchased 28 packs of paper for $146. How many were plain copy paper and how many were bright copy paper?

Answer 1

Donielle,

               This one uses the same basic idea as the last one.

 

            Let p=number of packs of plain paper purchased

                 b=number of packs of bright paper purchased then the following must be true

 

                 1. 4.5p+7b=146

                 2. p+b=28

                 3. p and b must be integers     I got b=8 p=20

Jim