Practice 6-4 this is 7th grade math

Question

How many boxes (x), of envelopes can you buy with $12 if one box costs $3?

Answer 1

This is a basic algebra word problem.

3x = 12

x = 4

If you don't know algebra, you could use trial and error

1 box costs $3

2 box = 2 X $3 =$6

3 box = 3 X $3 = $9

4 box = 4 X $3 = $12

Not so hard??