Question

A package of 4 mechanical pencils comes with 2 free erasers. If you get a total of 12 free erasers, how many packages of pencils did you buy? If you get 18 free erasers,how many packages of pencils did you buy?

Answer 1

6 packs and 9 packs

Explanation:

Answer 2

6 packs, 9 packs

Explanation:

The ratio of mechanical pencil to free eraser is 2:4, or 1:2.

So that means, for every free eraser you get, you bought the double amount of pencils.

12 free erasers x 2 = 24 pencils

18 free erasers x 2 = 36 pencils

And a pack of pencils contains 4.

24/4 = 6 packs

36/4 = 9 packs