The ratio of two numbers is 4 : 5 and their HCF is 3. Their LCM is:

Correct option is C

Given:

Ratio of two numbers = 4 : 5

HCF = 3

Concept Used:
If the ratio of two numbers is a : b and their HCF is h, then the numbers are 4h and 5h.
LCM × HCF = Product of the two numbers

Solution:
Let the numbers be 4 × 3 = 12 and 5 × 3=15

​$$\text{LCM} = \frac{12 \times 15}{3} = \frac{180}{3} = 60$$​