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प्रश्न
Before 3 years, the average age of a five-member family was 17 years. A baby having been born and the average of a family is now 17 years. The present age of the baby is
पर्याय
3 years
2 years
1 year
none of these
MCQ
उत्तर
2 years
Explanation:
Before 3 year ago average age of 5 members = 17
Total age = 17 × 5 = 85
Total present age of 5 members = 85 + 15 = 100
Present Average age of 6 members = 17
Total age = 17 × 6 = 102
Age of child = 102 – 100 = 2 years
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Average and Age
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