Answer:
50%
Step-by-step explanation:
Percentage who passed the written test, n(W)=70%
Percentage who passed the flight test, n(F)=80%
Total, [tex]n(F\cup W)=100[/tex]
[tex]n(F\cap W)=[/tex]Percentage of those who passed BOTH flying and Written Test.
From set notation,
[tex]n(F\cup W)=n(F)+n(W)-n(F\cap W)\\100=80+70-n(F\cap W)\\100=150-n(F\cap W)\\n(F\cap W)=150-100\\n(F\cap W)=50[/tex]
The percentage of the trainees who passed both tests is 50%.
