Current location - Health Preservation Learning Network - Slimming men and women - Lei Lei and Yang Yang both went to table tennis training. Lei Lei runs every three days and Yang Yang runs every seven days. When did they first meet again?
Lei Lei and Yang Yang both went to table tennis training. Lei Lei runs every three days and Yang Yang runs every seven days. When did they first meet again?
3 and 7 are prime numbers.

∴ Their common multiple is:

3×7=2 1

12+2 1=33 (days)

There is only 3 1 day in July.

33-3 1=2 (days)

Meet again on August 2 nd

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