The total number of students in section A and B of a class is 72. The ratio of the number of students in A and B is 7 : 5. The average weight (in kg) of the students in section B is 20% more than that of the students in section A. If the average weight of all the students in the class is 52 kg, then what is the average weight (in kg) of the students in section B?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 57.6
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Understanding |
Application |
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The total number of students in section A and B of a class is 72. The ratio of the number of students in A and B is 7 : 5. |
So, Number of students in section A = 72 × 7/12 = 42 And Number of students in section B = 72 × 5/12 = 30 |
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Suppose the average weight of students is section A = x So, The average weight of students is section B = 1.2x |
Since the average weight of all the students in the class is 52 kg. So, 42x + 30 × 1.2x = 52 × 72 78x = 3744 x = 48 |
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So, Average weight (in kg) of the students in section B = 1.2 × 48 = 57.6 |