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The average weight of 8 persons increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. The weight of the new person is
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- 84 kg
- 85 kg
- 76 kg
- 76.5 kg
- 84 kg
Correct Option: B
Weight of new person = (65 + 8 × 2.5) kg
Weight of new person = (65 + 20) kg = 85 kg
Aliter : Using Rule 23,
Here, x = 2.5, n = 8
Weight of new person = [ weight of replaced boy + x × n ]
Hence , Weight of new person = [ 65 + 2.5 × 8 ] = (65 + 20) kg = 85 kg
