Two numbers are in the ratio 12:7 and their sum is 291. Find the numbers. MCQ with Answer and Explanation
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Question #1
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If a:b = 5:9 and b:c = 9:6, then a:b:c = ?
Correct Answer: Option A
Explanation:
Combine ratios: a:b = 5:9, b:c = 9:6 ⇒ a:b:c = 5:9:6.
Combine ratios: a:b = 5:9, b:c = 9:6 ⇒ a:b:c = 5:9:6.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 7:5. After 7 years, the ratio becomes 10:8. Present age of A is?
Correct Answer: Option C
Explanation:
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. Solving gives k ≈ 18, age of A = 7*18 = 126.
Let ages 7k and 5k. Then (7k + 7)/(5k + 7) = 10/8. 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 ratio 11:7. Their difference is 58. What is their sum?
Correct Answer: Option C
Explanation:
Numbers 11k, 7k. Difference |11-7|k = 58 ⇒ k = 14. Sum = (11+7)k ≈ 252.
Numbers 11k, 7k. Difference |11-7|k = 58 ⇒ k = 14. Sum = (11+7)k ≈ 252.
This question belongs to:
Maths
Ratio and Proportion
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