Question

The average weight of 27 students of a class is 53 kg. If the weight of the teacher is included, the average rises by 700 grams. Find the weight (in kg) of the teacher.

• A. 65.5
• B. 78.3
• C. 62.8
• D. 72.6

Answer 1

Answer:

D. 72.6

We are given:

• 27 students’ average weight = 53 kg

• Teacher included → average increases by 700 g = 0.7 kg

• New average = 53 + 0.7 = 53.7 kg

  Total weight of 27 students

$27 \times 53 = 1431 \text{ kg}$

Total people = 28 (27 students + teacher)

New total weight:
$28 \times 53.7 = 1503.6 \text{ kg}$

Teacher’s weight

$1503.6 - 1431 = 72.6 \text{ kg}$

Final Answer: 72.6 kg