Q314
There are two groups A and B of a class, consisting of 42 and 28 students respectively. If the average weight of group A is 25 kg and that of group B is 40 kg, find the average weight of the whole class.
A.
69 kg
B.
31 kg
AnswerC.
70 kg
D.
30 kg
Answer: Option B
Solution
Answer: Option B
Solution:
According to the question,Average weight of whole class
=
=
= 31 kg