SOLUTION: In a group of 120 students, 75 know how to use a Macintosh, 65 know how to use a IBM compatible computr and 20 do not know how to use either kind. How many sstudents know how to us

Algebra ->  Human-and-algebraic-language -> SOLUTION: In a group of 120 students, 75 know how to use a Macintosh, 65 know how to use a IBM compatible computr and 20 do not know how to use either kind. How many sstudents know how to us      Log On


   

Question 158758This question is from textbook mathematics for elemantry school teachers
: In a group of 120 students, 75 know how to use a Macintosh, 65 know how to use a IBM compatible computr and 20 do not know how to use either kind. How many sstudents know how to use both computers? This question is from textbook mathematics for elemantry school teachers

Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
75+65+20=140
140-120=20 students use both types of computers.