Multiple choice

Robin gets an average aggregate of 72% marks in 5 subjects in the ratio 10:9:8:7:6. If the passing marks are 65% of maximum marks and each subject has the same maximum marks, in how many subjects did he pass?

  1. 3

  2. 1

  3. 2

  4. 4
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A Correct answer
Explanation

Average 72% for 5 subjects means total marks = 360%. Ratio 10:9:8:7:6 means parts are 40. Each part = 360/40 = 9. Marks: 90, 81, 72, 63, 54. Passing marks = 65. Subjects with >= 65 are 90, 81, 72. Total 3 subjects.

AI explanation

The first box weighs 40 kg, and the third box is 25 percent higher at 50 kg. The second box is 50 percent higher than the third box, so it weighs 75 kg. The fifth box weighs 100 kg since the 150 kg fourth box is 50 percent heavier than it. The four heaviest boxes weigh 150, 100, 75, and 50 kg for an average of 93.75 kg, while the four lightest boxes weigh 40, 50, 75, and 100 kg for an average of 66.25 kg. The difference between these averages is 27.5 kg.

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