Question 1191150
x large boxes
120-x small boxes
weight of the large boxes is 55x
small boxes weigh 25(120-x)=3000-25x
Those two add to 30x+3000=4950
so 30x=1950
x=65 large boxes (total weight is 3575 pounds)
120-x=55 small boxes (weight is 1375 pounds). those two add to 4950 pounds.