The school cafeteria used to burn 0.15 tons of coal per day. After the stove was rebuilt, it saved 0.03 tons of coal per day. It was originally planned to burn coal for 40 days. How many more days can it burn now?
学校食堂原来每天烧煤0.15吨，改建炉灶后每天节省用煤0.03吨，原来计划烧40天的煤，现在可以多烧多少天？
<gadget id="calculator">0.15 - 0.03</gadget>
<output>0.12</output>

<gadget id="calculator">40 / 0.12</gadget>
<output>333.333333</output>

<gadget id="calculator">0.03 * 333.333333</gadget>
<output>10</output>

<result>10</result>