Selected MCQ

Current Question
In a hostel, there were 100 students. If 20 more join and the average expense decreases by Rs. 5, what is the original average?
  • A. Rs. 5000
  • B. Rs. 4600
  • C. Rs. 5400
  • D. Rs. 2300
Correct Answer: C
Explanation:
Using weighted average adjustment gives Rs. 5400.
Related Question 1
Nine men went to a hotel. Eight spent Rs. 3 each, and the ninth spent Rs. 2 more than the average. What was the average expense?
  • A. Rs. 29.25
  • B. Rs. 30.25
  • C. Rs. 32
  • D. Rs. 35
Correct Answer: A
Explanation:
Let average = x → solve 8×3 + (x+2) = 9x → x = 29.25.
Related Question 2
A student scores 60 in Maths and Physics. Chemistry is 20 marks more than Maths. Find the average marks.
  • A. 40
  • B. 30
  • C. 25
  • D. Data inadequate
Correct Answer: A
Explanation:
Total = 60 + 60 + 80 = 200 → avg = 40.
Related Question 3
In an exam, three students score 64%, 36%, and 44% of 800 marks. What is the average score?
  • A. 384
  • B. 364
  • C. 324
  • D. 404
Correct Answer: A
Explanation:
Average = 48% of 800 = 384.
Related Question 4
In a fort, food lasts 2 months. After half a month, more people join. How long will food last?
  • A. 1.5 months
  • B. 40 days
  • C. 2 months
  • D. 50 days
Correct Answer: D
Explanation:
Adjusting the rate gives 50 days.
Related Question 5
In a camp, food for 500 men lasts 10 days. After 5 days, 200 more men joined. How long will the remaining food last?
  • A. 3 days
  • B. 8 days
  • C. 5 days
  • D. 1 day
Correct Answer: D
Explanation:
Remaining food consumed faster → lasts 1 day.