Question

Jenny goes to dance class every 6 days, karate class every 12 days, and to the library

every 18 days. On December 157 she went to both classes and the library. On what date
will she do both classes and go to the library?

Answer 1

On the 36th day, she would go to all classes.

My work:

6- 6, 12, 18, 24, 30, 36

12- 12, 24, 36

18- 18, 36