There are 50 tons of coal in the cafeteria, 5% of the total is used on the first day, and (5/4) tons are used on the second day, how many tons of coal are left?
食堂里有50吨煤，第一天用了总数的5%，第二天用了(5/4)吨，还剩下多少吨煤？
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">50 * (1/20)</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">50 - (5/2) - (5/4)</gadget>
<output>185/4 = around 46.25</output>

<result>185/4 = around 46.25</result>