Two trains, Train A and Train B, weigh a total of 530 tons. Train A is heavier than Train B. The difference of their weights is 352 tons. What is the weight of each train?
+57 A+B=530
A-352=B
Add 352 to both sides
A=B+352
Substitute
(B+352)+B=530
2B+352=530
2B=178
B=89
So if A=B+352 then
A = 89+352
A = 441
Train A = 441 tons
Train B = 89 tons
