Question

find the smallest number wch is divisible by 12, 15, 20 and is a perfect square.

Answer 1

Hey !!


Here is your answer

12 = 2 x 2 x 3

15 = 3 x 5

20 = 2 x 2 x 5

So, LCM = 2 x 2 x 3 x 5 = 60

As 3 and 5 are not in pair in LCM’s factor so we need to multiply 60 by 5 and 3 to make it a perfect square.

Required smallest number = 60 × 3 × 5 = 900

Answer 2

Hey mate here is your answer .

12 = 2×2×3
15= 3×5
20 = 2×2×5

So LCM wil be
2×2×3×5 =60

As 3 and 5 are not in pair in LCM's factor , so we need to multiply 60 by 3 and 5.

60×3×5 = 900.

So the number is 900 (. that is the square root of 30)

Hope it helps