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A bakery opened yesterday

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boomgoesthegmat Senior | Next Rank: 100 Posts Default Avatar
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A bakery opened yesterday

Post Thu Apr 28, 2016 1:40 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    A bakery opened yesterday with its daily supply of 40 dozen rolls. Half of the rolls were sold by noon, and 80 percent of the remaining rolls were sold between noon and closing time. How many dozen rolls had not been sold when the bakery closed yesterday?

    A) 1
    B) 2
    C) 3
    D) 4
    E) 5

    D

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    Post Thu Apr 28, 2016 2:20 pm
    We start with 40.

    We sell half, so we're left with 20.

    We then sell 80% of the rest, or 80% of 20, or 16.

    So we're left with 20 - 16 => 4.

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