The fruit shop has 820 kilograms of fruit, sells 120 kilograms during the day, and buys 70 kilograms at night. According to this calculation, how many days will the fruit be sold out?
水果店有水果820千克，每天白天卖出120千克，晚上又进货70千克，照这样计算，多少天后水果恰好卖完？
<gadget id="calculator">820 - 120</gadget>
<output>700</output>

<gadget id="calculator">120 - 70</gadget>
<output>50</output>

<gadget id="calculator">700 / 50</gadget>
<output>14</output>

<gadget id="calculator">14 + 1</gadget>
<output>15</output>

<result>15</result>