Question
Average weight of all the people in a group is 65 kg.
When two people of weight 72 kg and 84 kg left the group, average weight reduces by 1 kg. Find the number of people in the group now.Solution
Let the number of people initially be 'n'.
So, 65n - 64 × (n - 2) = 72 + 84
Or, 65n - 64n + 128 = 156
Or, n = 28
Required number of people = 28 - 2 = 26
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