Test Index

UPSC CDS 1 2022 Math Paper

Question Numbers: 91-92

Direction : Consider the following data for the two (02) items that follow :

The table below gives the age-wise population percentage of a city :

The number of persons below the age of 40 years is 10.5 lakhs.

Question : 91 of 100

Marks: +1, -0

What is the total population of the city (in lakhs)?

Solution:

Concept:

Given the percentage of people below age 40 and their total number, find the total population using direct proportion.

Explanation:

People below 40 years form three age groups:

14.00\%

29.75\%

, and

26.25\%

Total percentage below 40 =

14.00 + 29.75 + 26.25 = 70\%

This

70\%

corresponds to

10.5

lakhs.

So,

1\%

of population =

\frac{10.5}{70} = 0.15

lakhs.

Total population is

100\%

, hence

100 \times 0.15 = 15

lakhs.

Answer:

15 lakhs (Option C).

Go to Question:

Prev Question

Next Question