bag of rice weighs 100 catties, and 50% of it is eaten in the first week. How much rice is left uneaten?
一袋大米100斤，第一周吃了50%，还有多少大米没有吃？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">100 * (1/2)</gadget>
<output>50</output>

<result>50</result>