Answers

2015-12-13T19:27:37+08:00
Let x = width
x + 7 = length

2x + 2(x+7) = 78
2x + 2x + 14 = 78
       4x + 14 = 78
4x + 14 - 14 = 78 - 14
                4x = 64
          4x ÷ 4 = 64 ÷ 4
                  x = 16 - length
            x + 7 = 23 - width


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