Ninety students auditioned for the school play. One-third of those who auditioned were cast, 6 in major roles. What fraction of these who were cast got major roles? Write your answer as a decimal.

Answer 1

One-third of 90 is (1/3)*90 = <<(1/3)*90=30>>30 students.
So, there are 30 students who were cast.
Six of these 30 students got major roles.
Therefore, the fraction of these students who were cast and got major roles is 6/30 = 1/5.
As a decimal, this is equal to 1/5 = <<1/5=0.2>>0.2. Answer: \boxed{0.2}.