Question:A school has only three classes which contain `40, 50` and `60` students respectively. The pass percentage of the school is : 

A `13 1/3` 
B `15` 
C `20` 
D `16 2/3` 

+ Answer
A 

+ Explanation
Number of passed candidates

`= (10/100 xx 40 + 20/100 xx 50 + 10/100 xx 60)`

`= (4 + 10 + 6)`

`= 20`

Pass percentage

`= 20/((40 + 50 + 60)) xx 100`

`= (20/150 xx 100)%`

`13 1/3 %`

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Irin Moni

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