Answer: There are 75% professional professors tenured.
Step-by-step explanation:
Since we have given that
Percentage of professors are academic professors = 60%
Percentage of professors are tenured = 70%
Percentage of professors are academic professors or tenured or both = 90%
So, we make a table:
Academic Professional Total
Tenured 60+70-90=40 30 70
Not Tenured 20 10 30
Total 60 40 100
So, Percent of the professional professors that are tenured is given by
[tex]\dfrac{30}{40}\times 100\\\\=75\%[/tex]
Hence, There are 75% professional professors tenured.