Question

Find the greatest number by which 90,120 and 150 are exactly divisible​

Answer 1

30

Explanation:

30 is divisible by 90, 120 and 150

Answer 2

30

Explanation:

Prime factors of 90 = 2 x 3^2 x 5

Prime factors of 120 = 2^3 x 3 x 5

Prime factors of 150 = 2 x 3 x 5^2

Common prime factors with lowest exponent: 2, 3, 5

HCF(highest common factor) = 2 x 3 x 5 = 30