Question

Please guys help to solve this problem​

Answer 1

`300`

hope it helps

#CARRYONLEARNING

Answer 2

9514 1404 393

Answer:

300

Explanation:

Since nobody failed, the number who passed one or the other was 100%.

P(O + W) = P(O) +P(W) -P(O&W)

100% = 80% +70% -P(O&W)

P(O&W) = 50% = 150 students

If 150 students are 50% of the examinees, then 100% will be 300 students.