Two numbers are in ratio 12:10. Their difference is 74. What is their sum? MCQ with Answer and Explanation
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Question #1
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If a:b = 2:3 and b:c = 3:11, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 2:3, b:c = 3:11 ⇒ a:b:c = 2:3:11.
Combine ratios: a:b = 2:3, b:c = 3:11 ⇒ a:b:c = 2:3:11.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 3:8. After 10 years, the ratio becomes 4:10. Present age of A is?
Correct Answer: Option C
Explanation:
Let ages 3k and 8k. Then (3k + 10)/(8k + 10) = 4/10. Solving gives k ≈ 17, age of A = 3*17 = 51.
Let ages 3k and 8k. Then (3k + 10)/(8k + 10) = 4/10. Solving gives k ≈ 17, age of A = 3*17 = 51.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Find the mean proportional between 36 and 21.
Correct Answer: Option B
Explanation:
Mean proportional = √(36 × 21) = √(756) = 27.
Mean proportional = √(36 × 21) = √(756) = 27.
This question belongs to:
Maths
Ratio and Proportion
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