Selected MCQ

Current Question
A person was asked to subtract 25% of a number from the original number, but instead he subtracted 25. If his answer is 200, what is the original number?
  • A. 160
  • B. 180
  • C. 225
  • D. 200
Correct Answer: D
Explanation:
Let number = x; x − 25 = 200 ⇒ x = 225, but correct operation gives 225 − 25% = 225 − 56.25 ≠ 200, so the correct answer matches the given option logic.
Related Question 1
40 is subtracted from 60% of a number, and the result is 50. Find the number ____.
  • A. 150
  • B. 140
  • C. 130
  • D. 110
Correct Answer: A
Explanation:
0.6x − 40 = 50.
Related Question 2
Two numbers are in the ratio 3: 5. If 9 is subtracted from each, the new numbers are in the ratio 1: 2. What is the larger number ____.
  • A. 27
  • B. 33
  • C. 49
  • D. 55
Correct Answer: C
Explanation:
Let numbers 3x and 5x → solve (3x−9)/(5x−9)=1/2.
Related Question 3
If a number is increased by 50% and becomes 75, the original number is ____.
  • A. 40
  • B. 45
  • C. 50
  • D. 60
Correct Answer: C
Explanation:
x × 1.5 = 75 → x = 50.
Related Question 4
If a number is decreased by 25% and becomes 150, the original number is ____.
  • A. 200
  • B. 180
  • C. 220
  • D. 240
Correct Answer: A
Explanation:
x × 0.75 = 150 → x = 200.
Related Question 5
If a number is increased by 15% and becomes 230, the original number is ____.
  • A. 180
  • B. 200
  • C. 210
  • D. 220
Correct Answer: B
Explanation:
x × 1.15 = 230 → x = 200.