Selected MCQ

Current Question
The average salary of 20 workers is Rs. 5000. If one leaves and the average becomes Rs. 4800, what was his salary?
  • A. Rs. 6000
  • B. Rs. 7000
  • C. Rs. 8000
  • D. Rs. 9000
Correct Answer: D
Explanation:
Difference = Rs. 4000.
Related Question 1
The population of a town increased from 175000 to 262500 in 10 years. Find the average annual percentage increase.
  • A. 4.37%
  • B. 5%
  • C. 6%
  • D. 8.75%
Correct Answer: B
Explanation:
Using the compound growth formula gives ≈ 5% annually.
Related Question 2
The average of 7 numbers is 49. If one number is replaced by 70, the average becomes 50. What was the original number?
  • A. 40
  • B. 42
  • C. 43
  • D. 45
Correct Answer: B
Explanation:
Difference in total = 7 ⇒ original = 42.
Related Question 3
The average of 5 numbers is 20. If one number is excluded, the average becomes 18. What is excluded number ____.
  • A. 25
  • B. 28
  • C. 30
  • D. 35
Correct Answer: B
Explanation:
Total = 100, new total = 72 → difference = 28.
Related Question 4
A is a working partner, and B is a sleeping partner. A invests Rs. 15000, and B invests Rs. 25000. A gets 10% of the profit as salary. Total profit is Rs. 42000. What is A’s share?
  • A. Rs. 3240
  • B. Rs. 3600
  • C. Rs. 3800
  • D. Rs. 4200
Correct Answer: D
Explanation:
A gets a salary plus a share of the remaining profit.
Related Question 5
Three years ago, the average age of 6 members was 19. Find the present age of a boy.
  • A. 1 year
  • B. 1.5 years
  • C. 2 years
  • D. 2.5 years
Correct Answer: A
Explanation:
Total age difference method.