Problema Solution
130 baseball fans in a Maryland county have been surveyed about the baseball teams they watch on TV. 85 fans watch the Washington Nationals. 67 fans watch the Baltimore Orioles. 115 watch the Washington Nationals or the Baltimore Orioles or both.
How many of the fans watch the Nationals and not the Orioles?
Answer provided by our tutors
let person watches was nat is x and Baltimore ori is y
thus,
xUy=115
x=85
y=67
now
number of person doesn't watch any =130-115=15
x and y=x+y-xUy= 85+67-115=37