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21 January, 11:53

Jenny decided to grow out her hair. Over 6 months, her hair length grew by 100%. During the next 6 months, her hair length grew by 50%. What was the combined increase in hair length during the entire year

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  1. 21 January, 12:18
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    In your mind, you could think 100% more is 200% and 50% of that is another 100% so 200% increase. Let's see on paper. x will be her current hair length.

    x + x +.5 (x + x)

    x + x is simply her hair length doubling. This is when it grew 100% longer. Then, from that, we have 50% more, so we have to add 50% of the x + x.

    2x +.5x +.5x

    3x

    Subtract our starting length.

    3x - x = 2x

    The difference is 2 hair lengths, or 200% her original length of hair.
  2. 21 January, 12:22
    0
    150% in 12 months ...
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