The supermarket bought a batch of mineral water, which has been sold (3/5), and there are 120 boxes left. How many boxes of mineral water did the supermarket buy?
超市购进了一批矿泉水，已经卖出(3/5)，还剩120箱，超市购进了多少箱矿泉水？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<result>300</result>