The school carried out environmental protection and poverty alleviation activities. It planned to collect 120 kilograms of waste paper in 20 days, but actually collected 2 kilograms more than the original plan every day. How many days did it actually take to collect waste paper?
学校开展环保扶贫活动，计划20天收集120千克废纸，实际每天比原计划多收集2千克，收集废纸实际用了多少天？
<gadget id="calculator">120 / 20</gadget>
<output>6</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">120 / 8</gadget>
<output>15</output>

<result>15</result>