Multiple choice

Average weight of 50 students is 60 kg. When the teacher is added, the new average becomes 62 kg. Teacher's weight is:

  1. 160 kg

  2. 162 kg

  3. 165 kg

  4. 170 kg
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total weight of 50 students = 50 * 60 = 3000 kg. Total weight with teacher = 51 * 62 = 3162 kg. Teacher's weight = 3162 - 3000 = 162 kg.

AI explanation

The total weight of the 50 students is 50 times 60, which equals 3000 kg. Including the teacher, the total weight for 51 people becomes 51 times 62, giving 3162 kg. The difference between 3162 kg and 3000 kg gives the teacher's weight, which is 162 kg.

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