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The average weight of a class of 20 stud...

The average weight of a class of 20 students is 45 kgs. A new student whose weight is 40 kgs replaces an old student of this class. Hence, the average weight of the whole class decreases by 1 kg. The weight of the replaced student is :

A

55 kgs

B

50 kgs

C

60 kgs

D

none of these

Text Solution

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The correct Answer is:
C
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Knowledge Check

  • The average weight of a class of 20 students is 45 kgs.A new student whose weight is 40 kgs replace an old student of this class.Hence the average weight of the whole class decreases by 1 kg.the weight of the replace student is:

    A
    55 kgs
    B
    50 kgs
    C
    60 kgs
    D
    none of these

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    A
    70 kg
    B
    72 kg
    C
    75 kg
    D
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  • The average weight of a class of 40 students is 30 and the average weight of a class of 20 students is 15. Find the average weight of both the combined classes :

    A
    20
    B
    25
    C
    17.5
    D
    15

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