Cut a watermelon into 8 pieces on average, parents each ate 3 pieces, and Xiaolin ate the rest. How much of the watermelon did Xiaolin eat?
把一个西瓜平均切成8块，爸爸妈妈各吃了3块，剩下的给小林吃了，小林吃了这个西瓜的几分之几？
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) + (3/8)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>