Question

A family needs to cross a river in a small raft.

Father weighs 90kg, mother weighs 80kg, son
weighs 60kg, daughter weighs 40kg, and they have
a 20kg bag. The raft cannot bear a load heavier
than 100kg. How can they all get to the other side
with their bag?

Answer 1

so basically you can take more than one trip you can take the mother and the bag at the same time

Explanation:

and then you can get the daughter in the son at the same time and then for the final trip you take the father by himself