Uncle Wang’s family has a square land with a side length of 20 meters. If (2/5) of this land is planted with corn, how many square meters is the area for planting corn?
王大伯家有一块正方形的地，边长是20米，如果这块地的(2/5)种玉米，种玉米的面积是多少平方米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">20 * 20 * (2/5)</gadget>
<output>160</output>

<result>160</result>