The average weight of students in a class of $32$ students is $\mathrm{40 }\mathrm{}\mathrm{k}\mathrm{g}$. If the weight of the teacher be included, the average rises by $\frac{1}{\mathrm{3 }} \mathrm{k}\mathrm{g}$, then the weight of the teacher is

• A

  $\mathrm{40.5 }\mathrm{}\mathrm{k}\mathrm{g}$
• B

  $\mathrm{50 }\mathrm{}\mathrm{k}\mathrm{g}$
• C

  $\mathrm{41 }\mathrm{}\mathrm{k}\mathrm{g}$
• Correct answer
  D

  $\mathrm{51 }\mathrm{}\mathrm{k}\mathrm{g}$

Hence, the correct answer is option: 'D'.