The average weight of 20 students in a class is increased by 0 75 kg when one of the students weighi...........

Quantitative Aptitude ( CCS) Average

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

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Explanation:

When the average increases by 0.75 it implies that each value increase by 0.75
but here only one weight is changed
so new weight
=old weight +(change *number of students)
=30+(0.75*20)
=30+15=45 kg

Hence, option 3 is the correct answer.