in a survey of 425 students in a school it was found that 115 drink apple juice 160 drink orange juice and 80 drink both, how many drink neither apple nor orange juice

n(apple juice,A)=115
n(orange juice,O)=160
n(A union O)=80
n(A intersection O)=?
n(A union O)= n(A) + n(O) - n(A intersection O)
80 = 115 + 160 - n(A intersection O)
n(A intersection O)=115 + 160 - 80
                            =195