Average weight of 25 students of a class is 50 kg. If the weight of the class teacher is included , the average is increased by 1 kg. The weight of the teacher is ?
A. 76 kg
B. 77 kg
C. 74 kg
D. 75 kg
Show Answer
Answer-A
Solution-
Solution(By Apex Team)
According to the question,
Average weight of 25 students = 50 kg
Sum of the weight of 25 students
= 50 × 25 = 1250 kg
If the class teacher included the average is increased by 1 kg.
∴ Average weight of 25 students and teacher = 51 kg
$\begin{array}{l}\text{∴ Sum of weight}\\
\text{= 26 × 51}\\
\text{= 1326 kg}\\
\text{∴ Class teacher weight}\\
\text{= 1326 – 1250}\\
\text{= 76 kg}\end{array}$
