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7 June, 16:18

60 centimeters make a border around a rectangular. The width is 20 centimeters. What is the lenght?

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  1. 7 June, 17:29
    0
    We have 60 = 2·20 + 2·l, where l = the length;

    Then, 60 = 40 + 2·l;

    20 = 2·l;

    l = 10 centimeters.
  2. 7 June, 17:42
    0
    10 centimeters

    2*20+2*l=60

    40+2*l=60

    2*l=20

    divide both sides by 2:

    l=10
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