Directions (Q. No. 21 – 22) : These questions are based on the information and diagram given below :
A survey was conducted on a sample of 500 cinema artists with reference to their proficiency in the skill of acting, singing and dancing. The results of the survey are depicted in the given Venn diagram.

21. What is the ratio of the number of cinema artists who are not proficient in any of these three skills (X₀) to those who are proficient in all three (X₃)?

1. 5 : 7

2. 6 : 7

3. 3 : 5

4. 1 : 9

Correct Answer :

3 : 5