90% ofall students passeed in Hindi, 85% in Maths and 150 students passed in both. Find the total number of students in the school.

Let the total no. of students in the school= x

Number of students who passed Hindi= 90% of x

Number of students who passed Maths= 85% of x

and 

Number of students who passed both Hindi & Maths=150

Hence, the total no. of students in the school= 200

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