The vegetable experiment base harvested 8 tons of vegetables this year, among which the weight of cucumbers accounted for (2/5), and the weight of cucumbers was (4/5) that of eggplants. How many tons of eggplants were harvested this year?
蔬菜实验基地今年共收获8吨蔬菜，其中黄瓜的重量占(2/5)，黄瓜的重量是茄子的(4/5)，今年收茄子多少吨？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(2/5) / (4/5)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<result>4</result>