In a class of 120 student 70 student passes in english 80 student pass in hindi and 40 passes in both english and hindi how many student failed in both the student

Total students that failed in both subjects would be 10

Step-by-step explanation:

Students that passed English : 70 - 40 = 30

Students that passed Hindi : 80 - 40 = 40

Total students that passed both subjects 110 (40 + 40 + 30)

120 - 110 = 10 students failed in both subjects

The 30 & 40 come from the students that passed each subject above, then the extra 40 comes from the amount of students that passed both.