A bag of rice weighs 50 kg. I ate 15kg on the first day, and the rest (5/7) on the second day, how many kilograms are left?
一袋大米重50千克．第一天吃了15千克，第二天吃了剩下的(5/7)，还剩多少千克？
<gadget id="calculator">50 - 15</gadget>
<output>35</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">35 * (2/7)</gadget>
<output>10</output>

<result>10</result>