Question

smallest number divisible by 15,20,24,32,36

Answer 1

the smallest no. divisible by any two or more numbers is the L.C.M. of all those numbers.
therefore, taking the LCM of 15,20,24,32,and 36 
2*2*2*2*2*3*3*5*5= 7200
so 7200 is the required number.

Answer 2

Lowest common multiple of 15, 20, 24, 32, 36 is 1440.

To find:  

“Smallest number” divisible by 15, 20, 24, 32, 36.

Solution:

To find the least number divisible by ‘15, 20, 24, 32 & 36’, we have to find L.C.M. of the given numbers.

The “smallest positive number” that is a “multiple of two or more numbers”.  

L.C.M of ‘15, 20, 24, 32 & 36’ is derived in below attached image.

Hence, L.C.M. $\bold{=2 \times 2 \times 2 \times 3 \times 5 \times 4 \times 3=1440}$.