Sock vs. Toothbrush

Question

You are collecting pairs of socks & toothbrushes for a local charity. After (d) days, you have collected (4d+5) pairs of socks and (3d+7) toothbrushes.

 

How many more pairs of socks than toothbrushes have been collected on day 7?

Answer 1

Socks

4 * 7 + 5 = 28 + 5 = 33

 

Toothbrushes:

3 * 7 + 7 = 21 + 7 = 28

 

So you now have the two numbers to calculate how many more socks than toothbrushes are donated.