Question:A's marks in Biology are `20` less than `25%` of the total marks obtained by him in Biology, Maths and Drawing. If his marks in Drawing be `50` what are his marks in Maths ? 

A `40` 
B `45` 
C `50` 
D Can't be determined 

+ Answer
D 

+ Explanation
Let B + M + D = x.

Then, `B = (25% of x - 20)`

`= (25/100 x - 20)`

`= (x/4 - 20) & d = 50`

`:. x/4 - 20 + M + 50`

`= x or M = ((3x)/4 - 30)`

So, marks in Maths cannot be determined

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