algebra fraction

Question

At the Club, everybody likes windsurfing and parasailing or both. 3/5 of those who like windsurfing also like parasailing. 1/4 of those who like parasailing also like windsurfing. Find, in simplest form, the fraction of club members who like only windsurfing.

Answer 1

Answer 2

Draw a table with the number of people that like both (separate boxes for Wind->Para and Para->Wind) and plug in a random number for the total number of people in the club. Once you have that, just solve the box for the ones that like only Windsurfing.