For a batch of grain, 25 tons are taken out for the first time, and the remaining 40% is taken out for the second time, and half is left. How many tons was this batch of grain originally?
一批粮食，第一次取出25吨，第二次取出余下的40%，还剩下一半．这批粮食原来有多少吨？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">25 * (2/5)</gadget>
<output>10</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (2/5) - (1/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">15 / (1/10)</gadget>
<output>150</output>

<result>150</result>