Question

a couple went for picnic they have 5 sons and each have 7 sisters and each have 3 babies in total how many went for picnic

Answer 1

Only 2 people went for picnic --- as it is written a couple----and the others didn't go 

Hope it helps

Answer 2

The answer is $TwO$ ...... It is mentioned in the question that a couple went for a picnic. Only the no. of sons they have and the sons having further families are mentioned in the ques, but it isn't mentioned that they are also going for picnic. So we have to do nothing with sons, sisters and babies............... So only 2 people are going for the picnic.