### The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg.)

**A.** 55 kg

**B.** 57 kg

**C.** 66 kg

**D.** 56 kg

## Show Answer

###
Answer-D

Solution-

Solution(By Apex Team)

According to the question,
Total increase in weight including teacher
$\begin{array}{l}\text{= 400 × 35}\\
\text{= 14000 gm}\\
\text{= 14 kg}\end{array}$
If the teacher’s weight has been ’42’ kg so there would have not been any change in average weight.
$\begin{array}{l}\text{∴ Teacher’s weight }\\
=42+14\\
=56\ \text{kg}\end{array}$