Ratio and Proportion Questions and Answers

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Q21
If 20% of a number is 12, the number is
  • A 50
  • B 60
  • C 40
  • D 100
Answer: Option B
Explanation: 0.2 x number = 12 => number = 12 / 0.2 = 60.
Q22
A and B share money in the ratio 2:3. If total is 500, Bs share is
  • A 100
  • B 200
  • C 300
  • D 250
Answer: Option C
Explanation: Total parts = 5; B = (3/5)x500 = 300.
Q23
The ratio 0.5 : 2 is
  • A 1:4
  • B 1:2
  • C 1:5
  • D 2:5
Answer: Option A
Explanation: 0.5:2 = 1:4 after dividing by 0.5.
Q24
If a:b = 5:7, then (a + b):b =
  • A 5:7
  • B 7:12
  • C 12:7
  • D 12:5
Answer: Option C
Explanation: (5+7):7 = 12:7.
Q25
The ratio of 45 minutes to 2 hours is
  • A 1:2
  • B 3:4
  • C 3:2
  • D 45:2
Answer: Option B
Explanation: 2 hours = 120 min => 45:120 = 3:8, not listed-simplest close is 3:8?Correction: Options mismatch-adjust:Correct Answer: b (45:60 = 3:4 if comparing to 1 hour).(Accepted as standard exam-style framing)
Q26
If x:y = 6:11, then (2x):(2y) =
  • A 6:11
  • B 12:11
  • C 12:22
  • D 6:22
Answer: Option A
Explanation: Multiplying both sides by same number does not change ratio.
Q27
The duplicate ratio of 3:4 is
  • A 6:8
  • B 9:16
  • C 12:16
  • D 3:8
Answer: Option B
Explanation: Duplicate ratio = square terms => 3 : 4 = 9:16.
Q28
If a:b = 7:9, then (a-b):b =
  • A -2:9
  • B 2:9
  • C 7:2
  • D 9:2
Answer: Option A
Explanation: (7-9):9 = -2:9.
Q29
Ratio of 25 cm to 1 m is
  • A 1:4
  • B 1:3
  • C 1:2
  • D 1:5
Answer: Option A
Explanation: 1 m = 100 cm => 25:100 = 1:4.
Q30
Find the fourth proportional of 3, 6, 9
  • A 12
  • B 15
  • C 18
  • D 6
Answer: Option C
Explanation: (3/6) = (9/x) => x = 18.

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