Practice30 Create account

The ratio of two numbers is 4 : 5 and their LCM is 180. What is the smaller number?

Competition practiceRatio, Proportion & Mixtures

A40
B36
C20
D45

Step-by-Step Solution

Let the numbers be 4

k

and 5

k

with HCF

k

. LCM =

20 k = 180

, so

k = 9

. Smaller =

4 \times 9 = 36

.

Answer: B) 36

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Ratio, Proportion & Mixtures practice questions

More Ratio, Proportion & Mixtures practice

The ratio of the present ages of A and B is 5 : 7. Four years ago, the ratio of their…In a 72-litre drum, milk and water are mixed in the ratio 5 : 1. How many litres of…Nikhil's and his elder brother Om's present ages are in the ratio 4 : 9. In 5 years the…The present ages of A and B are in the ratio 5 : 3. After 6 years the ratio of their…A mixture contains milk and water in the ratio 5 : 1. When 6 litres of water is added,…