The school cafeteria bought a batch of rice. After eating some, there was 220kg left, and then 20% of the whole was eaten. At this time, the ratio of the mass of rice eaten to that not eaten was 5:1. How many kilograms is this batch of rice in total?
学校食堂买回一批大米，吃了一些后，还剩220kg，后来又吃了全部的20%，这时已经吃了的和没吃的大米质量之比为5：1．这批大米共有多少千克？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/6) + (1/5)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">220 / (11/30)</gadget>
<output>600</output>

<result>600</result>