Hefei Power Plant shipped a batch of coal. It was originally planned to burn 8 tons of coal per day, and it just finished burning in 45 days. Actually save 10% of coal every day, so how many days can it be burned? (Solve with ratio)
合肥电厂运来一批煤，原计划每天烧8吨煤，45天正好烧完．实际每天节约用煤10%，这样可以烧多少天？(用比例解)
<gadget id="calculator">8 * 45</gadget>
<output>360</output>

<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">8 * (1/10)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">8 - (4/5)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">360 / (36/5)</gadget>
<output>50</output>

<result>50</result>