There are some exercise books, which are distributed to 9 children on average, and 15 children have more than one. How many exercise books are there at least?

1, and find multiples of 9 and 15 respectively. Among the multiples of the two, the male one and the other are called their least common multiples, plus 1.

Multiples of 9: 9, 18, 27, 36, 45, ...

/kloc-multiples of 0/5: 15, 30, 45, 60, ...

2. Some multiples of two are: (45)

3. At least several copies: 45+ 1 = 46 (copies)

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