The average weight of 5 men decreases by 3 kg when one of them weighing 150 kg is replaced by another person. Find the weight of the new person.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 135 kg.
We know that,
Average = Sum of observations/Number of observations
Let, the average weight of 5 men be x kg and the weight of a new man be N kg
Now, total weight of 5 men = x × 5 = 5x
According to the given question,
5x - 150 + N = 5(x - 3)
⇒ 5x - 150 + N = 5x - 15
⇒ N = 150 - 15
⇒ N = 135
Hence, the weight of the new man is 135 kg