# algebra

of 320 consumers polled, some purchase Blu-ray movies, some purchase movies on DVD, and some do both. If 300 people polled purchase Blu-ray discs and 280 purchase DVD's and Blu-ray discs, how many people only buy DVD's?

1. 300+280-320 = 260

So, 260 bought both.
That means that 280-260=20 buy only DVDs

posted by Steve

## Similar Questions

1. ### math

Of 320 consumers polled, some purchase Blu-ray movies, some only purchase movies on DVD, and some do both. If 300 people polled purchase Blu-ray discs and 280 purchase DVDs and Blu-ray discs, how many people only buy DVDs?
2. ### Algebra 2

A factory is producing DVD and Blu Ray discs. For each case of DVDs they make \$180 profit. For each case of Blu Ray they make \$250. The DVDs take 3 minutes of machine time and 7 minutes of labor. The Blu Rays take 4 minutes of
3. ### Algebra 2

A factory is producing DVD and Blu Ray discs. For each case of DVDs they make \$180 profit. For each case of Blu Ray they make \$250. The DVDs take 3 minutes of machine time and 7 minutes of labor. The Blu Rays take 4 minutes of
4. ### Economics

Multiple Choice: If the price of movies on video rises while the price of movies on DVD remains the same, the law of demand predicts that consumers will: A) substitute movies on video for movies on DVD. B) substitute movies on DVD
5. ### algebra

Of 480 consumers polled, some purchase ice cream, some purchase frozen yogurt, and some purchase both. If 260 people polled purchase ice cream and 200 purchase both ice cream and frozen yogurt, how many people purchase frozen

Essie and Ruby sell Blu-Ray players. Last month Essie sold 35 less Blu-Ray players than Ruby. Together they sold 145. How many Blu-Ray players did Essie sell?