The Agricultural Science Research Institute has an experimental field of 200 square meters. First, set aside (2/5) of the total area to plant tomatoes, and the rest to plant cucumbers and eggplants at an area ratio of 3:1. How big is the area for cucumbers?
农业科学研究所有一块200平方米的试验田，先划出总面积的(2/5)种西红柿，剩下的按3：1的面积比种黄瓜和茄子，种黄瓜的面积有多大？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">200 * (2/5)</gadget>
<output>80</output>

<gadget id="calculator">200 - 80</gadget>
<output>120</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 * (3/4)</gadget>
<output>90</output>

<result>90</result>