The factory has a batch of coal. It is planned to burn 5.5 tons per day, and it can be burned for 70 days. In fact, it only burns 5 tons per day. How many more days can it burn than planned?
工厂有一批煤，计划每天烧5.5吨，可以烧70天，实际每天只烧5吨，这样可以比计划多烧多少天？
<gadget id="calculator">5.5 * 70</gadget>
<output>385</output>

<gadget id="calculator">385 / 5</gadget>
<output>77</output>

<gadget id="calculator">77 - 70</gadget>
<output>7</output>

<result>7</result>