The cafeteria brought in a batch of coal and used 50 tons, exactly (1/4) of this batch of coal was used up. How many tons is this batch of coal?
食堂运进一批煤，用去50吨，正好用去了这批煤的(1/4)．这批煤有多少吨？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">50 / (1/4)</gadget>
<output>200</output>

<result>200</result>