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Nabu's Knee-knocker SignHint

  1. First calculate

    80% of 200     (number of people who owned a VCR)

    50% of 200     (number of people who owned a computer)
    Then consider the people who owned both a VCR and a computer.

    A string picture (Venn Diagram) might help.



  2. There were 160 people (80% of 200 = 160) who owned a VCR. Since half (80) used their VCR to watch movies, half (80) used their VCR to tape TV shows, and 20% did neither, there must be some people who used their VCR to do both. A string picture (Venn Diagram) might help.


    Also, compare the total number of VCR owners to the number that actually used their VCRs.


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