Asked by Anonymous

90% of all students passed in Hindi, 85% in Maths and 150 students passed in both. calculate total number of students in the school.
Answered by Reiny
N( A or B) = N(A) + N(B) - N(A and B)

let the number of students be x

100% x = 90%x + 85% x - 150
x = .9x + .85x - 150
- .75x = -150
x = 200

There are 200 students in the school
Answered by Riya sankhwAr
Is very good
Answered by Anonymous
200
Answered by Smartty
N( A or B) = N(A) + N(B) - N(A and B)

let the number of students be x

100% x = 90%x + 85% x - 150
x = .9x + .85x - 150
- .75x = -150
x = 200

There are 200 students in the school
Answered by Anonymous
370
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