Question

A man caught a fish. It weight
5/7kg + 5/7 its own weight.What did it weigh?

Answer 1

weight = w
5/7 +5w/7 = w
5 + 5w = 7w
2w=5
w = 2 1/2

Answer 2

weight = w
5/7 + 5w/7 =w
5+5w = 7w
2w = 5
w = 2 1/2