SSC Quantitative Aptitude 2 — Questions and Answers
Question 1: The average of 5 numbers is 27. If one number is excluded, the average becomes 25. What is the excluded number?
- 30
- 35 (Correct answer)
- 40
- 45
Correct answer: 35
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)?
- 0.025
- 0.25 (Correct answer)
- 2.5
- 0.025
Correct answer: 0.25
√(0.0625) = √(625/10000) = 25/100 = 0.25.
Question 3: In a class of 40 students, 60% are girls. How many boys are there?
- 14
- 16 (Correct answer)
- 18
- 24
Correct answer: 16
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?
- 10%
- 12%
- 12.5% (Correct answer)
- 15%
Correct answer: 12.5%
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?
- 21 (Correct answer)
- 24
- 27
- 30
Correct answer: 21
From the equations: x=7, y=3; so xy = 7×3 = 21.
Question 6: The area of a rectangle is 120 cm² and its length is 15 cm. What is its perimeter?
- 38 cm
- 46 cm (Correct answer)
- 52 cm
- 60 cm
Correct answer: 46 cm
Width = 120/15 = 8 cm; Perimeter = 2(15+8) = 2×23 = 46 cm.
SSC Quantitative Aptitude 2
The average of 5 numbers is 27.
If one number is excluded, the average becomes 25.
What is the excluded number?