Xiaofang's birthday, mother bought a cake. Dad ate the cake (3/8), and mother let Xiaofang eat the cake except for the cake (1/8). How much of the cake did Xiaofang eat?
小芳过生日，妈妈买来一个蛋糕．爸爸吃了蛋糕的(3/8)，妈妈除了蛋糕的(1/8)，其余都让小芳吃了，小芳吃了这个蛋糕的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

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

<gadget id="calculator">1 - (3/8) - (1/8)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>