Find the mean proportional between 31 and 78. MCQ with Answer and Explanation
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Question #1
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If a:b = 8:9 and b:c = 9:6, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 8:9, b:c = 9:6 ⇒ a:b:c = 8:9:6.
Combine ratios: a:b = 8:9, b:c = 9:6 ⇒ a:b:c = 8:9:6.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Two numbers are in ratio 9:7. Their difference is 120. What is their sum?
Correct Answer: Option A
Explanation:
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.
Numbers 9k, 7k. Difference |9-7|k = 120 ⇒ k = 60. Sum = (9+7)k ≈ 400.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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If a:b = 4:3 and b:c = 3:8, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 4:3, b:c = 3:8 ⇒ a:b:c = 4:3:8.
Combine ratios: a:b = 4:3, b:c = 3:8 ⇒ a:b:c = 4:3:8.
This question belongs to:
Maths
Ratio and Proportion
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