A vegetable field is 480 square meters, of which (1/2) is planted with cabbage, (2/5) is planted with tomatoes, and the rest is planted with green onions. What is the area for planting green onions?
一块菜地480平方米，其中的(1/2)种白菜，(2/5)种西红柿，剩下的种大葱，种大葱的面积是多少？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">480 * (1/10)</gadget>
<output>48</output>

<result>48</result>