Question

Two trains, train A and train B,weigh a total of 240 tons. Train A is heavier than train B. The difference of their weights is 70 tons. What is the weight of each train?

Answer 1

Train A : 155 tons ; Train B : 85 tons

Explanation:

Call train A as A, train B as B

A + B = 240t
A - B = 70t

Add these 2 together, we get :
A + B + A - B = 310t
2A = 310t (B-B = 0)

So, A = 155
B = 240 - 155 = 85