Study the given graph and answer the question that follows.
The given graph represents the percentage of books. on different subjects that a person has in his library.
If the total number of books is 60, then what is the ratio of the number of books on subject C1 to the average number of books per subject?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 2 :5.
Given that
If the total number of books is 60,
the number of books on subject C1 = (10/100) × 60 = 6
the number of books on subject C2 = (20/100) × 60 = 12
the number of books on subject C3 = (30/100) × 60 = 18
the number of books on subject C4 = (40/100) × 60 = 24
the average number of books per subject = (6 + 12 + 18 + 24)/4 = 60/4 = 15
Hence, the required ratio = 6/15 = 2/5 i.e. 2 : 5