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The LCM of two numbers is 18 and their HCF is 3. If one number is 9, find the other number.
1. 10
2. 7
3. 6
4. 8

1 Answer

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Correct Answer - Option 3 : 6

Given:

L. C. M of two multiples = 18

H. C. F = 3

One the number = 9

Formula used:

L. C. M × H. C. F = First number × Second number

Calculation:

Let the other number be x.

L. C. M × H. C. F = First number × Second number

⇒ 18 × 3 = 9 × x

⇒ x = (18 × 3)/9

⇒ x = 54/9 

⇒ x = 6

∴ The other number is 6

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