Two numbers are in ratio 10:12. Their difference is 61. What is their sum? MCQ with Answer and Explanation
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Question #1
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Two numbers are in ratio 6:8. Their difference is 69. What is their sum?
Correct Answer: Option C
Explanation:
Numbers 6k, 8k. Difference |6-8|k = 69 ⇒ k = 34. Sum = (6+8)k ≈ 224.
Numbers 6k, 8k. Difference |6-8|k = 69 ⇒ k = 34. Sum = (6+8)k ≈ 224.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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If a:b = 3:9 and b:c = 9:10, then a:b:c = ?
Correct Answer: Option B
Explanation:
Combine ratios: a:b = 3:9, b:c = 9:10 ⇒ a:b:c = 3:9:10.
Combine ratios: a:b = 3:9, b:c = 9:10 ⇒ a:b:c = 3:9:10.
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 A
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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