SSC Quantitative Aptitude 2

Question 1

The average of 5 numbers is 27. If one number is excluded, the average becomes 25. What is the excluded number?

Accepted Answer

35

Answer

Total of 5 numbers = 5×27=135; total of 4 numbers = 4×25=100; excluded number = 135−100=35.

Question 2

What is the value of √(0.0625)?

Accepted Answer

0.25

Answer

√(0.0625) = √(625/10000) = 25/100 = 0.25.

Question 3

In a class of 40 students, 60% are girls. How many boys are there?

Accepted Answer

16

Answer

Girls = 60% of 40 = 24; Boys = 40 − 24 = 16.

Question 4

A sum doubles itself in 8 years at simple interest. What is the rate of interest per annum?

Accepted Answer

12.5%

Answer

SI = P (doubles means SI = P); P = P×R×8/100, so R = 100/8 = 12.5%.

Question 5

If x + y = 10 and x − y = 4, what is the value of xy?

Accepted Answer

21

Answer

From the equations: x=7, y=3; so xy = 7×3 = 21.

SSC Practice Test