On Children's Day, the teacher bought 40 big balloons and five ribbons. 16 balloons are hung on each ribbon. Ask how to hang them (five-pointed star shape).

Each of the five ribbons has 16 balloons, which means there should be 80 balloons, but now there are only 40. What should I do?

Then one will be used as two.

The five-pointed star has ***5 angles, and there are 5 intersections in the middle, each with 4 intersections. Because there will be two ribbons passing through the middle intersection and corner, one ribbon is used as two.

In this way, each ribbon will have four squares to hang four ribbons, *** 16.