Multiple choice

Alifa's marks in 5 subjects are in ratio 10:9:8:7:6. Passing marks = 50%. If she scores an average of 60%, how many subjects did she pass?

  1. 1

  2. 2

  3. 3

  4. 4

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

Let the marks be 10x, 9x, 8x, 7x, 6x. Total = 40x. Average = 8x. Given average = 60%, so 8x = 60, x = 7.5. The marks are 75, 67.5, 60, 52.5, 45. Passing marks = 50% of 100 (assuming max 100) = 50. The subjects with marks >= 50 are 75, 67.5, 60, 52.5. That is 4 subjects.

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