Question

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

(a) 60. (b) 90. (c) 120 (d) 180​

Answer 1

The answer is (d)
The easiest way to solve the question mathematically is to find the LCM of all the numbers.

And I personally will only just start from their 10th multiple
9 - 90, 99, 108 e.t.c
12 - 120, 132, 144 e.t.c
15 - 150, 165, 180 e.t.c

The end