Question
Average weight of all the people in a group is 58 kg.
When two people of weight 65 kg and 81 kg left the group, average weight reduces by 1.2 kg. Find the number of people in the group now.Solution
Let the number of people initially be 'n'.
So, 58n - 56.8 × (n - 2) = 65 + 81
Or, 58n - 56.8n + 113.6 = 146
Or, 1.2n = 32.4
Or, 'n' = 27
Required number of people = 27 - 2 = 25
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