A factory transported a batch of coal, originally planned to burn 7 tons per day, which can be burned for 150 days. Due to the improvement of coal-burning technology, the actual burning of 6 tons per day, how many more days can be burned?
某工厂运进一批煤，原计划每天烧7吨，可以烧150天．由于改进了烧煤技术，实际每天烧6吨，可以多烧多少天？
<gadget id="calculator">150 / 6</gadget>
<output>25</output>

<gadget id="calculator">7 * 25</gadget>
<output>175</output>

<gadget id="calculator">175 - 150</gadget>
<output>25</output>

<result>25</result>