Uncle Li bought 22 bags of the same fertilizer with 900 yuan, leaving 20 yuan. How much is an average bag of fertilizer?
李大爷带900元买了22袋同一种化肥，还剩20元．平均每袋化肥多少元？
<gadget id="calculator">900 - 20</gadget>
<output>880</output>

<gadget id="calculator">880 / 22</gadget>
<output>40</output>

<result>40</result>