Question

The average weight of 10 men is decreased by 3 kg when one of them whose weight is 80 kg is replaced by a new person. The weight of the new person is

• A. 70
• B. 60
• C. 50
• D. 73

Answer 1

The correct option is C 50

Let weight of $9$ men $=x$.

Weight of new men $=y$

According to the question,

$\frac{x+80}{10}-3=\frac{x+y}{10}$

$\frac{x+80-30}{10}=\frac{x+y}{10}$

$x+50=x+y$

$y=50kg$

Hence, this is the answer.