Question

77) A lift can carry only 6 people with an average
weight of 65 kg each. If the average weight of
5 people in the lift is 67.2 kg, then what can be th
maximum weight of the sixth person?​

Answer 1

A 55kg

B 64kg

C 60kg

D 54kg

Answer 2

Given:

A lift can carry only 6 people with an average  weight of 65 kg each

To find:

The maximum weight of the sixth person

Solution:

We have given the average weight of the six peoples as 65.

So the total weight of the persons carry by the lift is given by:

Sum = Average × Number of the person

Sum = 65 × 6

Sum = 390

And the average weight of the 5 persons is 67.2 Kg

So the total weight of the five persons is given by:

Sum' = Average × Number of the person

Sum' = 67.2 × 5

Sum' = 336

So, the weight of the sixth person will be:

Weight = Sum - Sum'

Weight = 390 - 336

Weight = 54

Hence,

The maximum weight of the sixth person can be 54 kg