A batch of coal, originally planned to burn 96 kg per day, can be burned for 45 days. The actual burning is 72 kilograms per day. How many more days will the actual burning be than the original plan?
一批煤，原计划每天烧96千克，可烧45天．实际每天烧72千克，实际比原计划要多烧多少天？
<gadget id="calculator">45 / 72</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">96 * (5/8)</gadget>
<output>60</output>

<gadget id="calculator">60 - 45</gadget>
<output>15</output>

<result>15</result>