A survey is taken among customers of a fast-food restaurant to determine preference for hamburger or chicken. Of 200 respondents selected, 75 were children and 125 were adults. 120 preferred hamburger and 80 preferred chicken. 55 of the children preferred hamburger.

Question

What is the probability that a randomly selected individual is an adult?

Answer 1

Too much information. The key sentence is

Of 200 respondents selected, 75 were children and 125 were adults.

so, 125/200 = 5/8 were adults