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The average weight of 20 students is 60kg.If the weight of the teacher is added, average is increased by 2kg.What was the teacher’s weight ?
  • a)
    100kg
  • b)
    101kg
  • c)
    102kg
  • d)
    103kg
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The average weight of 20 students is 60kg.If the weight of the teacher...
's weight?

Let the weight of the teacher be x kg.

According to the question,

The total weight of 20 students = 20 × 60 = 1200 kg

The total weight of 20 students and the teacher = 20 × 60 + x

The new average weight = (1200 + x) / 21

It is given that the new average is increased by 2 kg. So,

(1200 + x) / 21 = 60 + 2

1200 + x = 21 × 62

1200 + x = 1302

x = 1302 - 1200

x = 102 kg

Therefore, the weight of the teacher is 102 kg.
Community Answer
The average weight of 20 students is 60kg.If the weight of the teacher...
Total weight of 20 persons = 20*60=1200 kg
Average weight is increased by 2 kg, then average weight becomes 62 kg.
Total weight of 21 persons = 21*62= 1302 kg
Therefore, Weight of the teacher= 1302 - 1200
= 102 kg.
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The average weight of 20 students is 60kg.If the weight of the teacher is added, average is increased by 2kg.What was the teacher’s weight ?a)100kgb)101kgc)102kgd)103kgCorrect answer is option 'C'. Can you explain this answer?
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