Two numbers are in the ratio 12:9 and their sum is 569. Find the numbers. MCQ with Answer and Explanation
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Question #1
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Two numbers are in ratio 12:10. Their difference is 74. What is their sum?
Correct Answer: Option B
Explanation:
Numbers 12k, 10k. Difference |12-10|k = 74 ⇒ k = 37. Sum = (12+10)k ≈ 264.
Numbers 12k, 10k. Difference |12-10|k = 74 ⇒ k = 37. Sum = (12+10)k ≈ 264.
This question belongs to:
Maths
Ratio and Proportion
Question #2
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Ratio of present ages of A and B is 7:4. After 7 years, the ratio becomes 10:5. Present age of A is?
Correct Answer: Option B
Explanation:
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.
Let ages 7k and 4k. Then (7k + 7)/(4k + 7) = 10/5. Solving gives k ≈ 12, age of A = 7*12 = 84.
This question belongs to:
Maths
Ratio and Proportion
Question #3
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Ratio of present ages of A and B is 6:6. After 12 years, the ratio becomes 8:7. Present age of A is?
Correct Answer: Option A
Explanation:
Let ages 6k and 6k. Then (6k + 12)/(6k + 12) = 8/7. Solving gives k ≈ 12, age of A = 6*12 = 72.
Let ages 6k and 6k. Then (6k + 12)/(6k + 12) = 8/7. Solving gives k ≈ 12, age of A = 6*12 = 72.
This question belongs to:
Maths
Ratio and Proportion
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