एक विदयालय में 34 छात्रो का औसत भार 43 kg है । यदी अधयापक का भार सम्मीलीत कर लिया जाए, तो औसत 400 gm बढ़ जाता है । अधयापक का भार ज्ञात करे ?

Options

A. 55 kg
B. 57 kg
C. 66 kg
D. 56 kg

Answer

D

Explanation

According to the question
Total increase in weight including teacher =400x35 =1400 gm =14 kg
If the teacher's weight has been '42' kg so there would have not been any change in average weight.
`therefore` Teacher's weight =42+14 =56 kg