The original batch of grain in the warehouse was transported 25%, and then 240 tons were transported in. At this time, the quality of the grain in the warehouse was 80 tons more than the original one. How many tons of grain was there in the warehouse?
仓库里原有一批粮食，运出25%后，又运进240吨，这时仓库粮食的质量比原来的多80吨，仓库里原有粮食多少吨．
<gadget id="calculator">240 - 80</gadget>
<output>160</output>

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

<gadget id="calculator">160 / (1/4)</gadget>
<output>640</output>

<result>640</result>