The area of one wall is 20 square meters, and (1/3) of the whole wall has been painted. How many square meters has been painted?
一面墙的面积是20平方米，已经刷完了整面墙的(1/3)．已经刷完的面积是多少平方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 * (1/3)</gadget>
<output>20/3 = around 6.666667</output>

<result>20/3 = around 6.666667</result>