200 and 180 students of school A & B passed the exam. 20% and 10% students from A and B did not pass the exam. How many students appeared in the exam from both the schools?

Explanation

Number of students of school A who passed the exam = 200. Percent of students of school A who did not pass the exam = 20% ⇒ Percent of students of school A who pass the exam = 80% ⇒ 80% students of school A = 200 ⇒ Total students in school A = 250. Number of students of school B who passed the exam = 180. Percent of students of school B who did not pass the exam = 10% ⇒ Percent of students of school B who pass the exam = 90% ⇒ 90% students of school B = 180 ⇒ Total students in school B = 200. ⇒ Total students in both the schools = 450. ∴ 450 students appeared in the exam from both the schools.