The school cafeteria bought a batch of rice, 75% of which was eaten, and there were 90 kg left. How many kg is this batch of rice?
学校食堂买来一批大米，已经吃了75%，结果还剩90千克，这批大米有多少千克？
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">90 / (1/4)</gadget>
<output>360</output>

<result>360</result>