The average weight of 18 boxes in a boat is increased by 2.5 Kg when one of the boxes weighing 75 Kg is replaced by a new box. The weight (in Kg) of the new box is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e.120.
New Value = Old Value + (Change in Average × Total number of items)
Total number of boxes = 18
Change in average = +2.5 kg
Old (replaced) box weight = 75 kg
Weight of new box = 75 + (2.5 × 18) = 75 + 45 = 120 kg