The area of the bottom of a cube carton is (2/3) square meters, how many square meters of cardboard should be used to make such a carton.
一个正方体纸箱的底面积是(2/3)平方米，做这样一个纸箱至少要用多少平方米的硬纸．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) * 6</gadget>
<output>4</output>

<result>4</result>