The two ate the cake together, Wang Ke ate the cake (4/7), Xiao Li ate the cake (3/7). What fraction of the cake did Wang Ke eat more than Xiao Li?
两人一起吃蛋糕，王可吃了这个蛋糕的(4/7)，小利吃了这个蛋糕的(3/7)．王可比小利多吃了这个蛋糕的几分之几？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<result>1/7 = around 0.142857</result>