After the side length of a square is increased by (1/3), the perimeter of the obtained square is 48 cm. What is the side length of the original square in cm?
一个正方形的边长增加(1/3)后，得到的面正方形的周长是48厘米，则原来正方形的边长是多少厘米．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">48 / 4 / (4/3)</gadget>
<output>9</output>

<result>9</result>