Dad bought a big watermelon and cut it into 10 pieces on average. He ate 4 pieces himself, mother ate 3 pieces, and Xiaoqing ate the rest. How much of the watermelon did Xiaoqing eat?
爸爸买回一个大西瓜，把它平均切成了10块，他自己吃了4块，妈妈吃了3块，小庆把剩下的都吃完了．小庆吃了这个西瓜的几分之几？
<gadget id="calculator">10 - 4 - 3</gadget>
<output>3</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>