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Math Help - Smaller Billboard

  1. #1
    MHF Contributor
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    Smaller Billboard

    The lengths of the sides of two similar rectangular billboards are in the ratio 5:4. If 250 square feet of material is needed to cover the larger bill-board,
    how much material, in square feet, is needed to cover the smaller billboard?


    This is my work:

    5x + 4x = 250

    9x = 250

    I then divided and got a decimal number.
    I knew then that my answer was wrong.
    I played with this question for 20 minutes in vain.

    Help!
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  2. #2
    Like a stone-audioslave ADARSH's Avatar
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    Wink

    Hi,
    i think u can use following way
    Let the sides of first rectangle be 5x & 5y
    than other has 4x & 4y
    for covering u need to see the area(else see the unit of quantity given)
    now, u have
    area of first =25x*y=250......(1)
    u have to find
    area of second =16x*y=?.....(2)
    u can get the value from (1) put it in (2) u get the ans.
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  3. #3
    MHF Contributor
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    great

    Quote Originally Posted by ADARSH View Post
    Hi,
    i think u can use following way
    Let the sides of first rectangle be 5x & 5y
    than other has 4x & 4y
    for covering u need to see the area(else see the unit of quantity given)
    now, u have
    area of first =25x*y=250......(1)
    u have to find
    area of second =16x*y=?.....(2)
    u can get the value from (1) put it in (2) u get the ans.
    Great tips and set up.
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