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There are 40 students in a class. Out of these students, one student whose weight is 100 kg goes away and at the same time a new student gets admitted into the class. Thus the average weight of the students increases by ¼ kg. find the weight of the new student.

A.	105kg	B.	115kg
C.	107kg	D.	110kg

Answer and Explanation

Answer:110kg

Explanation:
∑X / n = ∑X / 40
Let A = weight of new student
X_new = X + 0.25
∑X_new = ∑X – 100 + A
(X + 0.25)40 = (X)40 – 100 + A
40X + 10 = 40X – 100 + A
A = 110 kg

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