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Mathematical problems in primary schools
How to use three people to wash your hair at least? A. Shampoo only takes 8 minutes. B. Shampoo and haircut15min C. Shampoo, haircut and shaving Mathematical problems in primary schools:

How to use three people to wash your hair at least?

A. Shampoo only takes 8 minutes.

B. Shampoo and haircut15min

Shampoo, haircut and shave for 30 minutes.

How can a barber arrange a reasonable order in the least time?

The sequence of A, B and C takes the least time, which takes at least 8+ 15+30=43 minutes.

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