The average weight of 20 students in a class is increased by 0.75 kg when one of the students weighing 30 kg is replaced by a new student. Weight of the new student (in kg) is:
Solution(By Examveda Team)
let avg weight of 20 students is x.after replacing a student who weight is 30kg with y kg student avg weight will be x + 20*0.75 = x + 15
therefore x - 30 + y = x + 15
⇒ y = 45
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