Question

The smallest number that is divisible by each one of$9,12,15$is:

Answer 1

The smallest number that is divisible by each one of $9,12,15$ is the LCM of $9,12,15$.

By division method,

2	9	12	15
2	9	6	15
3	3	3	15
3	3	1	5
5	1	1	5
	1	1	1

LCM$(9,12,15)=2\mathrm{x}2\mathrm{x}3\mathrm{x}3\mathrm{x}5=180$

Hence, $180$ is the required number.