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Math Help - SAT rectangle problem

  1. #1
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    SAT rectangle problem

    If the length of a rectangle is increased by 30% and the width of the same rectangle is decreased by 30%, what is the effect on the area of a rectangle?
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    Re: SAT rectangle problem

    Obviously the area of a rectangle with length L and width W is L*W, so, you want to think about how you might modify this product to reflect the fact that L is 30% larger and W is 30% smaller; if you then write this new product down, hopefully you'll be able to see how the area is modified.
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  3. #3
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    Re: SAT rectangle problem

    i got no change somehow... but that is wrong... This is a level 5 question on the SAT practice test. No wonder its pretty difficult
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    Re: SAT rectangle problem

    Quote Originally Posted by Mat724 View Post
    If the length of a rectangle is increased by 30% and the width of the same rectangle is decreased by 30%, what is the effect on the area of a rectangle?
    original rectangle ... A_1 = LW

    modified rectangle ... A_2 = (1.3L)(0.7W) = 0.91LW = 0.91A_1
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