Half a month ago, the canteen purchased 63 tons of rice, and it has been used for 15 days, with an average of 1.4 tons per day. If the remaining rice is 1.2 tons per day, how many days can it be used?
半个月前饭堂购入63吨大米，已经用了15天，平均每天用1.4吨，余下的米，如果每天用1.2吨，还可以用多少天？
<gadget id="calculator">1.4 * 15</gadget>
<output>21</output>

<gadget id="calculator">63 - 21</gadget>
<output>42</output>

<gadget id="calculator">42 / 1.2</gadget>
<output>35</output>

<result>35</result>