If a:b = 2:8 and b:c = 8:4, then a:b:c = ? MCQ with Answer and Explanation
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Question #1
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If a:b = 4:5 and b:c = 5:8, then a:b:c = ?
Correct Answer: Option D
Explanation:
Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.
Combine ratios: a:b = 4:5, b:c = 5:8 ⇒ a:b:c = 4:5:8.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Two numbers are in ratio 9:11. Their difference is 102. What is their sum?
Correct Answer: Option D
Explanation:
Numbers 9k, 11k. Difference |9-11|k = 102 ⇒ k = 51. Sum = (9+11)k ≈ 400.
Numbers 9k, 11k. Difference |9-11|k = 102 ⇒ k = 51. Sum = (9+11)k ≈ 400.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 3:7. After 5 years, the ratio becomes 5:10. Present age of A is?
Correct Answer: Option D
Explanation:
Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.
Let ages 3k and 7k. Then (3k + 5)/(7k + 5) = 5/10. Solving gives k ≈ 24, age of A = 3*24 = 72.
This question belongs to:
Maths
Ratio and Proportion
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