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Math!

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A rectangle is 15cm x 12cm. If the length is reduced by R cm and its width is increased by R cm. Its area is reduced by 4cm^2.

  • Math! - ,

    I assume you are looking for the value of R
    Original rectangle has area 15x12 or 180 cm^2

    new length = 15-R
    new width = 12+R

    so 180 - (15-R)(12+R) = 4

    solve for R

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