If the LCM of two numbers is 72, HCF is three, and the first number is 18, the second number will be ____? - IQ786

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If the LCM of two numbers is 72, HCF is three, and the first number is 18, the second number will be ____?

If the LCM of two numbers is 72, HCF is three, and the first number is 18, the second number will be ____?

15

9

12

None of these

Explanation

We know that:

LCM × HCF = Product of the two numbers

Given:

LCM = 72

HCF = 3

First number = 18

Let's denote the second number as x.

Using the formula:

72 × 3 = 18 × x

216 = 18x

x = 216 / 18

x = 12