90% of the students in school passed in English, 85% passed in Mathematics and 150 students passed in both the subjects. If no student failed in both the subjects, find the total number of students

If the total number of students be x, then

$x=\frac{90 x}{100}+\frac{85 x}{100}-150$

$\Rightarrow 100 x=90 x+85 x-15000$

$\Rightarrow 175 x-100 x=15000$

$\Rightarrow 75 x=15000 \Rightarrow x=200$