Question : The ratio of two numbers is 3 : 4 and their HCF is 5. Their LCM is:
Option 1: 10
Option 2: 60
Option 3: 15
Option 4: 12
Correct Answer: 60
Solution : Given: Ratio of two numbers is 3 : 4 and their HCF is 5. Here, the common factor is 5. So, the numbers will be 3 $\times$ 5 = 15 and 4 $\times$ 5 = 20 Now, 15 = 3 × 5 and 20 = 4 × 5 LCM = 3 × 4 × 5 = 60 Hence, the correct answer is 60.
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