A pile of 200 tons of yellow sand is transported away (3/10) on the first day, (1/4) on the second day, and the rest is transported on the third day. How many tons are transported on the third day?
一堆黄砂200吨，第一天运走(3/10)，第二天运走(1/4)，剩下的第三天运，第三天运多少吨？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/10) - (1/4)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">200 * (9/20)</gadget>
<output>90</output>

<result>90</result>