The average weight of 8 persons increased by 2.5kg If a new person replaces one weighing 50kg. What is the weight of the new person?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 70 kg
Let's assume the average of 8 person is x.
So, the sum of the age of 8 person = 8x
The weight of the new person is k.
ATQ,
⇒ (8x - 50 + k)/8 - x = 2.5
⇒ 8x - 50 + 5 - 8x = 20
k = 70 kg