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Saravanan has scored an total of 90% in an examination with five subjects in the ratio 18:14:15:21:22. If 85% is the marks required to get an ‘A’ grade in each subject, then find in how many subjects did he get an ‘A’ grade. Given that the maximum marks in each subject is 120. A) 2 B) 3 C) 4 D) 5

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Saravanan has scored an total of 90% in an examination with five subjects in the ratio 18:14:15:21:22. If 85% is the marks required to get an ‘A’ grade in each subject, then find in how many subjects did he get an ‘A’ grade. Given that the maximum marks in each subject is 120. A) 2 B) 3 C) 4 D) 5 
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Answer: B)

Maximum total marks = 5 × 120 = 600

Marks scored by Saravanan = 90/100*600=540

Let the marks scored by him in the 5 subjects be 18x,14x,15x,21x and 22x respectively.

18x + 14x + 15x + 21x + 22x = 540 ⇒ 90x = 540 ⇒ x = 6.

So, The marks scored by him in each of the subjects are 18x = 108, 14x = 84, 15x = 90, 21x = 126, 22x = 132

minimum 80% marks are required for ‘A’ grade i.e. 0.85 × 120 = 102

Therefore, he has got an ‘A’ grade in 3 subjects.


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