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UPSC NDA I and II 2020 Math Solved Paper

DIRECTIONS (Qs. 31-33) : Read the following information and answer the three items that follow:
Consider the following Venn diagram, where X,Y and Z are three sets. Let the number of elements in Z be denoted by n(Z) which is equal to 90.

[NDA-I 2020]

Question : 31

Total: 120

If the number of elements in Y and Z are in the ratio 4 : 5 , then what is the value of b?

[NDA-I 2020]

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