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08 Dec 2021, 07:00
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
62% (01:31) correct
38%
(01:45)
wrong
based on 176
sessions
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Not Attempted Yet
The number of students in section A is 20 and that of section B is 25. If 5 students from section A go to section B , does the average weight of class B increase or decrease?
(1) The weight of heaviest student in section A is 50 kg and weight of the lightest student in section B is 35 kgs.
(2) The weight of the lightest student in section A is 45 kg and the weight of the heaviest student in section B is 40 kgs
(1) The weight of heaviest student in section A is 50 kg and weight of the lightest student in section B is 35 kgs.
(2) The weight of the lightest student in section A is 45 kg and the weight of the heaviest student in section B is 40 kgs
16 Dec 2021, 12:06
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Bunuel
Breaking Down the Info:
To answer this question, we need to know if the average weight of the 5 students from section A is greater than that of class B. If the average weight of A is greater, then it will increase the average weight of class B, vice versa.
Statement 1 Alone:
We don't know anything about the 5 students we are sending from A. Then statement 1 alone is insufficient.
Statement 2 Alone:
This confirms the entire class A is heavier than class B. Thus statement 2 alone is sufficient.
Answer: B
06 Oct 2025, 09:57
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nostrummolestiae
The number of students in section A is 20 and that of section B is 25. If 5 students from section A go to section B , does the average weight of class B increase or decrease?
The average weight in class B will increase if the average weight of the five students who transfer from A to B is greater than the average weight of class B initially.
(1) The weight of heaviest student in section A is 50 kg and weight of the lightest student in section B is 35 kgs.
The five who transfer could all weigh less than 35 kg, in which case the average weight of B would decrease. However, their average could also be more than that of B if they include heavier students, in which case the average weight of B would increase. Not sufficient.
(2) The weight of the lightest student in section A is 45 kg and the weight of the heaviest student in section B is 40 kgs
Since every student in A is heavier than every student in B, whichever five students transfer from A to B, their average weight will definitely be higher than that of B. Therefore, the average weight of class B will increase. Sufficient.
Answer: B.
