Xiaoming ate (2/5) and Xiaoli ate (1/5) a piece of chocolate, how much did they eat together?
一块巧克力，小明吃了(2/5)，小丽吃了(1/5)，两人一共吃了几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(2/5) + (1/5)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>