Xiaoxiao’s family bought a bottle of camellia oil. About 1/30 of this bottle of oil is used for cooking every day. How much is left after one week (7 days)?
笑笑家买来一瓶山茶油，每天烧菜大约用去这瓶油的(1/30)，一星期(7天)后还剩下几分之几？
<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 7</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">1 - (7/30)</gadget>
<output>23/30 = around 0.766667</output>

<result>23/30 = around 0.766667</result>