210 college students were asked in a survey if they preferred windows or mac brand computers . 60 students claimed that they preferred mac to windows brand computers . one third as many of the students who preferred mac to windows , equally preferred both brands . 90 of the students had no preference . how many of the students in the survey preferred windows to mac brand computers ?
120 = 60 ( mac ) + x ( window ) + 20 ( both ) = > x = 40 answer : b
subtract(subtract(subtract(210, 90), 60), divide(subtract(subtract(210, 90), 60), const_3))