There are two sections A and B of a class, consisting of 36 and 44 students’ respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class.
(1) 38 kg
(2) 38.30 kg
(3) 37.25 kg
(4) 36 kg
(5) 37 kg.

• (3) 37.25
  
  Average weight of the whole class=(Total weight of section A + Total weight of Section B)/(Total students of Section A & B)= (36*40 + 44*35)/(36+44)= (1440+1540)/80 =37.25
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• ans=37.25
  (36*40+44*35)/36+44
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