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Explanation:

Let the number of students initially be I and the number of students joining be J.

Average of students initially be a kg, while those joining be (a + 3) kg such that final average of all students becomes (a + 0.6) kg

Initial Students        Students Joining
       I                                  J
       a                             a + 3
                    a + 0.6    
      2.4                             0.6

⇒ I/J = 2.4/0.6 = 4/1

Hence, option (b).

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