Question

eight packs of pencils and two packs of crayons cost $30.if 7 packs of crayons cost $21, what is the ratio of the rice of the pack of crayons to the price of the packs fo pencils?

Answer 1

p = number of pencil packs c = number of crayon packs

8p + 2c = 30
7c = 21

c = $3
One pack of crayons costs $3.00

Plug 3 into the top equation for the value of c and evaluate for p.
8p + 6= 30
- 6= -6
8p = 24
p = $3
One pack of pencils costs $3.00

The ratio of the price of the pack of crayons to the pack of pencils is 1:1.