Discussion

Explanation:

Let the number of defective cricket, tennis and rubber balls = c, t and r respectively.

Given, r/4 > c/6 > t/5   ...(1)

and (c + t + r)/15 = 2 × t/5

⇒ c + r = 5t

Also, maximum value of c + r can be 5 + 4 = 9

⇒ The value of t can only be 1.

⇒ c + r = 5   …(2)

The only possible value to satisfy (1) and (2) is r = 3 and c = 2.

Hence, option (a).

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