There is a piece of cake, Xiao Ming ate (1/5) of it, and Xiao Hua ate (2/5) of it. What fraction of the cake did the two eat together?
有一块蛋糕，小明吃了它的(1/5)，小华吃了它的(2/5)．两人共吃了这块蛋糕的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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

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