The original grain tonnage ratio between warehouses A and B is 5:4. After warehouse A transports 27 tons, the grain ratio between warehouses A and B is 4:5. How many tons of grain is there in warehouse A?
甲乙两个仓库原有粮食吨数比是5：4，甲仓库运走27吨后，甲乙两个仓库粮食之比是4：5，甲仓库原有粮食多少吨？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

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

<gadget id="calculator">(5/4) - (4/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">27 / (9/20)</gadget>
<output>60</output>

<gadget id="calculator">60 * (5/4)</gadget>
<output>75</output>

<result>75</result>