Question

Can someone help me with this word problem.

A notebook costs $3 and binders cost $7. If joe bought 4 notebooks and some binders for $47, how many binders did he buy?

Answer 1

4 x 3 = 12

47-12 = 35

35 divided by 7 is 5

so I believe he bought 5 binders

if you add it up it like 5 x 7= 35+12= 47

Answer 2

Yeah so the notebooks=n and binders=b

3n+7b=47
12+7b=47
-12 -12
7b= 35
b= 5