There was a batch of grain in the warehouse, and after 20% was transferred out, 40 tons were transferred in. At this time, the ratio of the grain in the warehouse to the original grain was 28:25. How many tons of grain is there in the warehouse?
仓库里原有一批粮食，调出20%后，又调入40吨，这时仓库的粮食与原来粮食的比是28：25，仓库中现有粮食多少吨？
<gadget id="calculator">28 / 25</gadget>
<output>28/25 = around 1.12</output>

<gadget id="calculator">20 / 25</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(28/25) - (4/5)</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">40 / (8/25)</gadget>
<output>125</output>

<result>125</result>