Question

Out of 120 students in an exam the number of students who passed mathematics only is twice the numberof students who passed in science. If 50 students passed in both subject and 40 students failed in both subjects. Find the number of students who passed in maths

Answer 1

(u) =120

(m) =20

('s) = 50

(m n 's) =40

( m u s) = ?

we know that

(u) =(m) +('s) +(mns) + (mus)

120=20 + x +50 + x +40 +x

120 = 110 + x

x = 120 –110

x = 10 ans