Average and difference – The average of Amit’s and Anil’s present ages is 32 years. If Amit is 6 years older than Anil, what is Anil’s present age?
Aptitude
Problems on Ages
Difficulty: Easy
Choose an option
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A26 years
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B29 years
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C38 years
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D19 years
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E31 years
Answer
Correct Answer: 29 years
Explanation
Introduction / Context:Average of two numbers and their difference uniquely determine each number. Convert the average to a sum and split using the half-difference idea.
Given Data / Assumptions:
- (Amit + Anil) / 2 = 32 ⇒ Amit + Anil = 64.
- Amit = Anil + 6.
Concept / Approach:Substitute into the sum to solve for Anil first, then compute Amit if needed. We only need Anil.
Step-by-Step Solution:(Anil + 6) + Anil = 64.2·Anil + 6 = 64 ⇒ 2·Anil = 58 ⇒ Anil = 29.
Verification / Alternative check:Amit = 35; average = (35 + 29) / 2 = 32, as stated.
Why Other Options Are Wrong:They do not satisfy both the sum and the 6-year difference simultaneously.
Common Pitfalls:Using 32 directly for one of the ages or halving the difference incorrectly.
Final Answer:29 years