A couple who has 5 sons went for a picnic. Each son has 7 sisters. Each sister has 3 babies. In total, how many people went for the picnic?

To solve this problem, we need to understand that the question specifically mentions a couple going for a picnic. It does not imply that their entire family accompanied them. Therefore, the total number of people who went for the picnic is just the couple themselves.

Answer: 2

This is because the question states, "A couple went for a picnic," and does not indicate that their children or grandchildren joined them4.