Discussion

Explanation:

Using the data we can have following Venn diagram.

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From the given data, we can form the following equations:

a + b + c + d = 42 – 18 = 24

⇒ a + b + c + d = 24 … (i)

a + b + c + 2(18) + 3d = 22 + 28 + 24 = 74 ⇒ a + b + c + 3d = 42 … (ii)

Solving (i) and (ii), d = 7

∴ 6 + 7 + 8 + b = 28 ⇒ b = 7

Hence, option (d).

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