Two trains

There were 159 freight wagons on the railway station creating 2 trains. One had 15 more wagons than the other. How many wagons did each train have?

Correct answer:

a =  87
b =  72

Step-by-step explanation:

a+b = 159
a = 15+b

a+b = 159
a-b = 15

a = 87
b = 72

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