Multiple choice

In a class of 50 students, 60% are boys. The average marks of the boys is 62, and that of the girls is 68. What is the average marks of the whole class?

  1. 64.8

  2. 64.4

  3. 65.2

  4. 64.6
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B Correct answer
Explanation

Boys = 60% of 50 = 30; Girls = 20. Total marks = (30 * 62) + (20 * 68) = 1860 + 1360 = 3220. Average = 3220 / 50 = 64.4.

AI explanation

In the class of 50 students, 60 percent are boys, meaning there are 30 boys and 20 girls. The total marks for the boys is 30 multiplied by 62, which equals 1860, and the total marks for the girls is 20 multiplied by 68, which equals 1360. The overall total marks are 1860 plus 1360, giving 3220, and dividing this by the 50 students yields an average of 64.4.

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