If a:b = 8:9 and b:c = 9:7, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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Find the mean proportional between 11 and 38.
Correct Answer: Option B
Explanation:
Mean proportional = √(11 × 38) = √(418) = 20.
Mean proportional = √(11 × 38) = √(418) = 20.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 7:8. After 11 years, the ratio becomes 8:9. Present age of A is?
Correct Answer: Option D
Explanation:
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.
Let ages 7k and 8k. Then (7k + 11)/(8k + 11) = 8/9. Solving gives k ≈ 18, age of A = 7*18 = 126.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Two numbers are in the ratio 3:4 and their sum is 120. Find the numbers.
Correct Answer: Option B
Explanation:
Numbers = 3k and 4k. 3k + 4k = 120 ⇒ k = 17. Thus, numbers are 51 and 68.
Numbers = 3k and 4k. 3k + 4k = 120 ⇒ k = 17. Thus, numbers are 51 and 68.
This question belongs to:
Maths
Ratio and Proportion
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