What fraction of students prefer mt rushmore over grand canyon ? write in simplest form ?

Can someone me and plz do the problem

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .

For what value of (y) is 3^3/3^y =1/9