The total area of a city is 5400 square kilometers, and the green area covers (7/20) of the total area. How many square kilometers is the green area?
某市总面积为5400平方千米，绿地覆盖面积占总面积的(7/20)，绿地面积有多少平方千米．
<gadget id="calculator">7 / 20</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">5_400 * (7/20)</gadget>
<output>1_890</output>

<result>1_890</result>