During the construction of the road around the lake, a car transported away 1/5 of the concrete for the first time and 25% for the second time. There is still 100 tons of concrete left to be shipped, how many tons of concrete were mixed this time?
环湖公路建设中，一辆汽车第一次运走混凝土(1/5)，第二次运走25%．还剩100T混凝土没有运，这次拌了多少T混凝土？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/5) - (1/4)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">110 / (11/20)</gadget>
<output>200</output>

<result>200</result>