Answer:
The fraction of the students who failed to went partying = [tex]\frac{1}{10}[/tex]
Step-by-step explanation:
Let total number of students = 100
No. of students partied are twice the no. of students who not partied.
⇒ No. of students partied = 2 × the no. of students who are not partied
No. of students partied before the exam = 20 % of total students
⇒ No. of students partied before the exam = [tex]\frac{20}{100}[/tex] × 100
⇒ No. of students partied before the exam =  20
No. of students who not partied before the exam = [tex]\frac{20}{2} = 10[/tex]
Thus the fraction of the students who failed to went partying = [tex]\frac{10}{100} = \frac{1}{10}[/tex]
