The weight of Container A

Question

The total weight of Container A and Container B is 71.4 pounds. The total weight of Container B and Container C is 58.5 pounds, The weight of Container C is 29.7 pounds. What is the weight of Container A?

Answer 1

A + B = 71.4

B + C = 58.5

C = 29.7

 

Just substitute backwards

B + 29.7 = 58.5

B = 58.5 - 29.7 = 28.8 pounds

 

A + 28.8 = 71.4

A = 71.4 - 28.8 = 42.6 pounds