Averages · Question 5 · Easy
Averages question 5
The average weight of 8 students is 50 kg. When the teacher's weight is included, the average increases by 2 kg. What is the teacher's weight?
- 60 kg
- 68 kg
- 66 kg
- 70 kg
Answer and explanation
Answer: B. 68 kg
Explanation: New total = 9 × 52 = 468 kg and the old total = 400 kg. Teacher's weight = 468 − 400 = 68 kg.
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