The cafeteria bought a batch of rice and ate 120 bags, three times the amount left. How many bags of rice are in this batch?
食堂买来一批大米，已经吃了120袋，是剩下的3倍．这批大米有多少袋？
<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<gadget id="calculator">40 + 120</gadget>
<output>160</output>

<result>160</result>