Uncle Li, a vegetable farmer, planted (1/20) hectares of cucumbers, (3/10) hectares of eggplants, and (2/5) hectares of tomatoes. How many hectares are the three crops planted in total?
菜农李大伯家种了(1/20)公顷的黄瓜，种了(3/10)公顷的茄子，种了(2/5)公顷的西红柿．三种农作物一共种了多少公顷？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">(1/20) + (3/10) + (2/5)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>