Subject: General Aptitude · Chapter: Average · Exam: 2006 · Marks: · Difficulty:
In a class there are 50 students. Their average weight is 45 kg. When a student leaves the class, the average is reduced by 100 g. Find the weight of the student who left the class.
Answer
Answer (as printed):
Explanation
Total weight of 50 students = (45 × 50) kg = 2250 kg. Average weight of 49 students = (45 kg – 100 g) = 44.9 kg. Total weight of 49 students = (44.9 × 49) kg = 2200.1 kg. \ Weight of the student who left the class = (2250 – 2200.1) kg = 49.9 kg.
Explanation as extracted from the printed page; notation may be imperfect.