Multiple choice

The average weight of a class of 24 students is 36 kg. When the weight of the teacher is included, the average weight of the class increases by 1 kg. What is the weight of the teacher?

  1. 60 kg

  2. 61 kg

  3. 55 kg

  4. 58 kg

  5. 62 kg
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial total weight = 24 * 36 = 864 kg. With the teacher, there are 25 people and the average is 37 kg. New total weight = 25 * 37 = 925 kg. Teacher's weight = 925 - 864 = 61 kg.

AI explanation

The total weight of the 24 students is 24 times 36, which equals 864 kg. When the teacher is included, the new average weight becomes 37 kg for 25 people, resulting in a new total weight of 25 times 37, or 925 kg. The teacher's weight is the difference between the new total weight and the original total weight of the students, which is 925 minus 864. The weight of the teacher is 61 kg.

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