Math

A company selling cell phones has a total inventor of 800 phones. Of these phones, 400 are smartphones and 240 are black. If 200 phones are not black and not a smartphones, how many are black smartphones?

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  1. Draw a Venn diagram. It is clear that

    800-(400+240-B&S) = 160+B&S = 200
    B&S = 40

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