The average weight of students in a class increases by 600 gm when some new students join the class. If the average weight of the new students is 3 kg more than the average weight of the original students, then the ratio of number of original students to the number of new students is
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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