There are 40 students in a class. Their average weight is 60 kg. Two students left the class. Then the average weight is reduced by 500 g. Find the weight of the two students who left the class (in kg).
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 139.
Old total = 40 × 60 = 2400 kg
New avg = 60 - 0.5 = 59.5 kg
New total = 38 × 59.5 = 2261 kg
Weight of 2 students = 2400 - 2261 = 139 kg