The average weight of a class is 20 kg. If the strength of the class is increased by 25%, then the average weight of the class gets increased by 1%. What. is the average weight of the additional students ? (a) 20-50 kg (b) 21-00 kg (c) 21-50 kg (d) 22-00 kg
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Answer:
C is correct option,I Hope this useful.
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Answer:
b
Step-by-step explanation:
Let the number of students in the class be n.
Average weight = 20 kg
Total weight of the class = 20n kg
After the strength of the class is increased by 25%
New number of students = n + 25% of n
= n(1 + 25/100) = 1.25n
Average weight = 20(1 + 1%) = 20(1 + 1/100) = 20.2kg
Total weight of the class = 1.25n × 20.2 = 25.25n kg
Increase in weight = 25.25n - 20n = 5.25n kg
Increase in the number of students = 0.25n
Average weight of the additional students
= 5.25n ÷ 0.25n = 21 kg.
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