Two numbers are in the ratio of 6 ∶ 5. If their HCF is 3, then what is the LCM of the two numbers?

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SSC CGL 2022 Tier-I Official Paper (Held On : 01 Dec 2022 Shift 3)
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  1. 64
  2. 110
  3. 90
  4. 80

Answer (Detailed Solution Below)

Option 3 : 90
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Detailed Solution

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Given:

Two numbers are in the ratio of 6 ∶ 5.

Their HCF is 3.

Concept used:

1. If P is the HCF of A and B then A = P × m & B = P × n. (Where m and n are arbitrary positive integers and they are co-prime to each other)

2. LCM is the smallest common multiple of two or more numbers.

Calculation:

First number = 6 × 3 = 18

Second number = 5 × 3 = 15

LCM (18, 15) = 3 × 6 × 5 = 90

∴  Their LCM is 90.

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