Answer:
Large boxes = 40 lbs.
Small boxes = 15 lbs.
Explanation:
L = Large Box
S = Small Box
I started by making the equations, L + S = 55 and 60L + 50S = 3150. I made the first equation L = 55 - S and substituted that in for L in 60L + 50S =3150. After finding S, I plugged that back into L + S = 55 and got the answers.