Dad bought a cake, Xiaohua ate (2/8) of this cake, and mother ate (1/8) of this cake, what percentage of this cake did Xiaohua and mother eat together?
爸爸买回来一个蛋糕，小华吃了这个蛋糕的(2/8)，妈妈吃了这个蛋糕的(1/8)，小华和妈妈共吃了这个蛋糕的几分之几？
<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/4) + (1/8)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>