Dad took his son and daughter out for a trip. There was a river on the way, and there was an empty boat at the ferry. It could carry up to 50 kilograms, and the father weighed 50 kilograms. The son an

Dad took his son and daughter out for a trip. There was a river on the way, and there was an empty boat at the ferry. It could carry up to 50 kilograms, and the father weighed 50 kilograms. The son and daughter

Since 25+25=50 (kilograms),

The father can only cross the river alone, but the children can cross the river in the same boat. Therefore, the river can be crossed as follows:

1. Let the son and daughter go over together.

2. The daughter or son rows the boat back, and the other person stays on the shore;

3. Let The father crossed the boat, and the remaining child on the other side rowed the boat back;

4. The two children rowed to the other side at the same time, so that the three of them could safely cross the river.