Multiple choice

The average weight of 25 students of a class is 28 kg. When 10 new students are admitted, the average increases by 2 kg. Find the average weight of the new students.

  1. 34 kg

  2. 36 kg

  3. 35 kg

  4. 33 kg

  5. 32 kg

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Original number of students (N) = 25

Original average weight (A) = 28 kg

Number of new students (n) = 10 

Difference between the average weights (d) = 2 kg

Now, apply this shortcut formula:

Average weight of new students = A + (N/n + 1)d

= 28 + (25/10 + 1)2

= 35 kg

So, the average weight of 10 new students is 35 kg.