In a survey of college students, each of the following was found. Of these students, 355 owned a tablet, 292 owned a laptop, 280
owned a gaming system, 191 owned a tablet and a laptop. 198 owned a tablet and a gaming system, 136 owned a laptop and a gaming system, 66 owned a tablet, a laptop, and a gaming system, and 24
owned none of these devices. Complete parts a) through e) below.
a) How many college students were surveyed?
(Simplify your answer.)
The total number of degrees in a triangle is 180. Since both sides of the triangle are the radius of the circle, the triangle is isosceles. Therefore the two opposite angles are equal. Thus, the central angle is 180° − 2(20°) = 140°.
