The average weight of 24 boys and 6 girls in a class is 40 kg. If the weight…
2024
The average weight of 24 boys and 6 girls in a class is 40 kg. If the weight of all the girls excluded the average weight of the class is reduced by 4 kg, then find the average weight of all the six girls?
Answer: B. 56 kg — Total weight of 30 students = 30 x 40 = 1200 kg. After excluding the 6 girls, the average of 24 boys is reduced by 4 kg, so boys' average = 36 kg. Total…
- A.
52 kg
- B.
56 kg
- C.
58 kg
- D.
55 kg
- E.
51 kg
Attempted by 41 students.
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Correct answer: B
Total weight of 30 students = 30 x 40 = 1200 kg.
After excluding the 6 girls, the average of 24 boys is reduced by 4 kg, so boys' average = 36 kg.
Total weight of boys = 24 x 36 = 864 kg.
Total weight of girls = 1200 - 864 = 336 kg, so average girls' weight = 336/6 = 56 kg.
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