algebra
posted by Sheena .
From a survey of 100 college students, a marketing research company found that 65 students owned ipods, 45 owned cars, and 15 owned both cars and Ipods.
(a) How many students owned either a car or an ipod (but not both)?
(b)How many students do not own either a car or an ipod?

Number(Ipad or Car)
= number(Ipad) + number(carss)  number(Ipads and cars)
= 65 + 45  15 = 95
which leaves 5 unaccounted for from the 100
so ....
a) 95 owned either Ipad or car
b) 5 owned neither
or
you could get the same result by constructing a Venn diagram