A big watermelon, Liangliang ate (3/5) of it, and his father also cut some after he came back, and finally only (1/6) was left uneaten. Ask, what percentage of this watermelon did Liangliang eat more than his father?
一个大西瓜，亮亮吃了它的(3/5)，爸爸回来后也切了一些，最后只剩下(1/6)没有吃完．问，亮亮比他爸爸多吃了这个西瓜的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (3/5) - (1/6)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(3/5) - (7/30)</gadget>
<output>11/30 = around 0.366667</output>

<result>11/30 = around 0.366667</result>