Question
Average weight of all the people in a group is 61 kg.
When two people of weight 66 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, 61n - 60 × (n - 2) = 66 + 84
Or, 61n - 60n + 120 = 150
Or, n = 30
Required number of people = 30 - 2 = 28
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