Multiple choice

The average weight of 6 students in a class is 50 kg. When a new student joins the class, the average weight of all the students increases by 1. What is the weight of the new student ?

  1. 45 kg

  2. 50 kg

  3. 55 kg

  4. 57 kg

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

Initial total weight = 6 * 50 = 300 kg. New total weight = 7 * 51 = 357 kg. New student weight = 357 - 300 = 57 kg.

AI explanation

The total weight of the original 6 students is 6 multiplied by 50, which equals 300 kg. When the new student joins, the average increases by 1 kg to 51 kg for 7 students, making the new total weight 7 multiplied by 51, which equals 357 kg. The weight of the new student is the difference between the new total and the old total, so 357 minus 300 equals 57 kg.

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