Find the mean proportional between 19 and 77. MCQ with Answer and Explanation
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Question #1
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If a:b = 2:7 and b:c = 7:8, then a:b:c = ?
Correct Answer: Option C
Explanation:
Combine ratios: a:b = 2:7, b:c = 7:8 ⇒ a:b:c = 2:7:8.
Combine ratios: a:b = 2:7, b:c = 7:8 ⇒ a:b:c = 2:7:8.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 5:7. After 6 years, the ratio becomes 6:10. Present age of A is?
Correct Answer: Option D
Explanation:
Let ages 5k and 7k. Then (5k + 6)/(7k + 6) = 6/10. Solving gives k ≈ 25, age of A = 5*25 = 125.
Let ages 5k and 7k. Then (5k + 6)/(7k + 6) = 6/10. Solving gives k ≈ 25, age of A = 5*25 = 125.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Two numbers are in the ratio 7:15 and their sum is 454. Find the numbers.
Correct Answer: Option A
Explanation:
Numbers = 7k and 15k. 7k + 15k = 454 ⇒ k = 20. Thus, numbers are 140 and 300.
Numbers = 7k and 15k. 7k + 15k = 454 ⇒ k = 20. Thus, numbers are 140 and 300.
This question belongs to:
Maths
Ratio and Proportion
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