In a town, 80% of the population are adults, of which the population of men and women is in the ratio 2 : 3. If the number of adult men is 1.2 lakh, what is the total population of the town?

3.75 lakh

Here,

80% of population is adult

Male : Female

 2     :    3

⇒ (2 + 3)units = 80

⇒ 5 units = 80

⇒ 1 unit = 16.

⇒ (16 x 2) units = 1,20,000

⇒ 1 unit = 3750

⇒ Total population = 3750 x 100 = 3.75 lakh