For a pile of 50 tons of coal, 25% of it is transported away on the first day, and the same amount is transported on the second day as on the first day. When the coal is finished on the third day, how many tons are transported on the third day?
一堆煤50吨，第一天运走25%，第二天运走的与第一天相等，第三天运完，第三天运走多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (1/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">50 * (1/2)</gadget>
<output>25</output>

<result>25</result>