SAT math

posted by Anonymous

The length of a rectangle was reduced by 10% and the width by x%. If the resulting dimensions reduced the area by 32.5%, what is the value of x?
A) 25
B) 21
C) 18
D) 13
I don’t know what to do at all.

  1. Steve

    the area LW is changed to
    (.90L)(1 - x/100)W = 0.675LW
    .9(1-x/100)=0.675
    1-x/100 = 0.75
    x/100 = .25
    x = 25

    or, you could just have said
    .9*z=.675
    z=.75
    so the width was 75% of its original size

    so, (A)

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