Question

A delivery truck is transporting boxes of two sizes: large and small. The combined weight of a large box and a small box is 75 pounds. The truck is transporting 70 large boxes and 60 small boxes. If the truck is carrying a total of 4900 pounds in boxes, how much does each type of box weigh?

Answer 1

For the total pounds of the truck to be 4900 pounds 

large = 40 pounds 

small = 35 pounds 

to see that this answer is correct 
40x70=2800
35x60=2100
        +=4900