algebra
posted by Berta .
of 320 consumers polled, some purchase Bluray movies, some purchase movies on DVD, and some do both. If 300 people polled purchase Bluray discs and 280 purchase DVD's and Bluray discs, how many people only buy DVD's?

algebra 
Steve
300+280320 = 260
So, 260 bought both.
That means that 280260=20 buy only DVDs
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