The average weight of a class of 20 students is 44 Kg. A new student joins the class and the average weight decreases by 300 gm. What is the weight of the new student (in Kg)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 37.7
Original average = 44 kg
New average = 44 − 0.3 = 43.7 kg
Number of students before = 20
Number of students after = 21
New student’s weight = New average × Total students − Total weight of old students
= 43.7 × 21 − 44 × 20 = 917.7 − 880 = 37.7 kg