Multiple choice

A class consists of 30 girls and 20 boys. Avg. weight of all girls is 45 kgs while the avg. weight of all boys is 60 kgs. Find the average weight of the class.

  1. 56 kg

  2. 54 kg

  3. 52 kg

  4. 51 kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The total weight of the class is (30 girls * 45 kg) + (20 boys * 60 kg) = 1350 + 1200 = 2550 kg. The total number of students is 30 + 20 = 50. The average weight is 2550 / 50 = 51 kg.

AI explanation

Calculate the total weight of the girls as 30 * 45 = 1350 kg, and the total weight of the boys as 20 * 60 = 1200 kg. The combined total weight of the entire class is 1350 + 1200 = 2550 kg. Divide this total by the total number of students (30 + 20 = 50) to get the average class weight: 2550 / 50 = 51 kg.

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