The average weight of a class of students is 67.5 kg. The weight of the class teacher is 25% more than the average weight of the class. The average weight of the class less than the class teacher by x%. The value of x is :

33.33%

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25%

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20%

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can't be determined

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Solution

The correct option is C 20%
Very fundamental quesion.
If one quantity is 25% (100/n) more than the other, then the other quantity is 20% (100/ n+1) less than the first.
In this case, n = 4.

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The average weight of a class of students is 67.5 kg. The weight of the class teacher is 25% more than the average weight of the class. The average weight of the class less than the class teacher by x%. The value of x is :

The correct option is C 20%Very fundamental quesion. If one quantity is 25% (100/n) more than the other, then the other quantity is 20% (100/ n+1) less than the first. In this case, n = 4.

The correct option is C 20%
Very fundamental quesion.
If one quantity is 25% (100/n) more than the other, then the other quantity is 20% (100/ n+1) less than the first.
In this case, n = 4.