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The average weight of a certain number of students in a group is 72kg.

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| The average weight of a certain number of students in a group is 72kg. If 10 students having an average weight of 78kg leave and 4 students having an average weight of 80kg join the group, the average weight of the students in the group decreases by 0.7 kg. The number of students initially in the group is :

A. 44

B. 46

C. 56

D. 54

Right Answer is: B

SOLUTION

Let the total no. of students

Average weight of students = 72 kg

Total weight = 72

When 10 students lefr and 4 students joined the group,

Now the total number of students = 10 – 4 = 6

Hence the total weight now

A.T.Q.

Solving for n –

We get

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    1. The average weight of a certain number of students in a group is 72kg.

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