The average weight of 32 students is 70 kg. If the weight of the teacher is also included, the average weight of the class becomes 70.5 kg. Calculate the weight of the teacher.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 86.5 kg.
Total weight of 32 students = 32 × 70 = 2240 kg
New total weight of 33 persons = 33 × 70.5 = 2326.5 kg
Teacher’s weight = 2326.5 − 2240 = 86.5 kg