Problema Solution
. 200 small businesses answered a questionnaire about their use of computers.
150 use IBM, 100 use Apple, and 60 use both.
a. How many use neither?
b. How many use IBM or Apple but not both?
Answer provided by our tutors
a.
200 - (150 + 100 - 60) = 200 - 190 = 10
10 businesses use neither.
b.
150 - 60 = 90 use only IBM
100 - 60 = 40 use only Apple
90 + 40 = 130 use IBM or Apple but not both.