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Math Help - Percent word problem

  1. #1
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    Percent word problem

    I know the answer is 4 but how do I show it to the following word problem:

    Dan has a rectangular graph 10 inches wide and 8 inches high that he needs to paste into a report for his class. He'll use a photocopy machine repeatedly to reduce the size of his graph. With each reduction, the width and the height will each be reduced to 80% of what they were. What is the minimum number of reductions using the photocopier that will allow the graph to fit in a space 3.5 inches high?
    Last edited by mr fantastic; March 19th 2010 at 06:18 PM. Reason: Restored deleted question
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  2. #2
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    Quote Originally Posted by sarahh View Post
    I know the answer is 4 but how do I show it to the following word problem:

    Dan has a rectangular graph 10 inches wide and 8 inches high that he needs to paste into a report for his class. He'll use a photocopy machine repeatedly to reduce the size of his graph. With each reduction, the width and the height will each be reduced to 80% of what they were. What is the minimum number of reductions using the photocopier that will allow the graph to fit in a space 3.5 inches high?
    In the first reduction the height is
    8*0.8 = 6.4 inches.
    In the second reduction the height is
    6.4*0.8 = ........
    Continue in this way until you get a height which is less than 3.5 inches.
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  3. #3
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    Ahh of course thanks!
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