When student weighting 45 kgs left a class, the average weight of the remaining 59 students increased by 200g. What is the average weight of the remaining 59 students?
Solution
Correct Answer: Option A
Let the average weight of the 59 students be A. So the total weight of the 59 of them will be 59 * A.
The questions states that when the weight of this student who left is added, the total weight of the class = 59A + 45 When this student is also included, the average weight decreases by 0.2 kgs.
Thus,
(59A + 45) / 60 = A - 0.2
=> 59A + 45 = 60A - 12 => 45 + 12 = 60A - 59A => A = 57
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