Exams › SSC CGL (Prelims) › General

Two numbers are in the ratio 6 : 5. If their HCF (Highest Common Factor) is 3, what is their LCM (Lowest Common Multiple)?

1. 64
2. 110
3. 90
4. 80

Correct answer: 90

Solution

The two numbers are 6x3 = 18 and 5x3 = 15. LCM(18,15): 18 = 2x3x3, 15 = 3x5. LCM = 2x3x3x5 = 90.

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