B. Find the width of a rectangle if its length is 5 more than the width and its perimeter is 90 cm.

Question

B. Find the width of a rectangle if its length is 5 more than the width and its perimeter is 90 cm.

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Hưng Khoa 4 years 2021-07-28T22:13:39+00:00 1 Answers 20 views 0

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  1. thanhcong
    0
    2021-07-28T22:15:15+00:00
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    Answer:

    Width is 20cm

    Step-by-step explanation:

    Step one:

    Given data

    let the width be x

    W= x

    L= x+5

    P= 90

    Step two:

    The expression for the perimeter is

    P= 2L+2W

    90= 2*x+2(x+5)

    90= 2x+2x+10

    collect like terms

    90-10=4x

    80= 4x

    divide both sides by 4

    x= 80/4

    x= 20

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