The total area of the school is 320 hectares, and the green area accounts for (3/8), so how many hectares is the ungreened area?
学校的总面积是320公顷，已经绿化的面积占(3/8)，那么未绿化的面积有多少公顷？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">320 * (3/8)</gadget>
<output>120</output>

<gadget id="calculator">320 - 120</gadget>
<output>200</output>

<result>200</result>