There is a batch of coal in the iron and steel factory. It was originally planned to burn 12 tons per day, and it can be burned for 50 days. If the savings (1/5) per day is less than the original plan, how many days can this batch of coal be burned?
钢铁厂有一批煤，原计划每天烧12吨，可以烧50天，如果每天比原计划节约(1/5)，这批煤可以烧多少天？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">12 * (4/5)</gadget>
<output>48/5 = around 9.6</output>

<gadget id="calculator">50 / (48/5)</gadget>
<output>125/24 = around 5.208333</output>

<gadget id="calculator">12 * (125/24)</gadget>
<output>125/2 = around 62.5</output>

<result>125/2 = around 62.5</result>