algebra

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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?

  • algebra -

    300+280-320 = 260

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

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