The school sports area accounts for (3/10) of the total area of the campus, and (2/3) of the sports area is the football field. The area of the football field is the total area of the campus.
学校运动区占校园总面积的(3/10)，运动区的(2/3)是足球场，足球场的面积是校园总面积的多少．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/10) * (2/3)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>