Uncle Li brought 900 yuan to buy chemical fertilizers. He bought 16 bags of chemical fertilizers and left 260 yuan. How much is each bag of chemical fertilizers on average?
李叔叔带900元买化肥，买了16袋化肥，还剩260元，平均每袋化肥多少元？
<gadget id="calculator">900 - 260</gadget>
<output>640</output>

<gadget id="calculator">640 / 16</gadget>
<output>40</output>

<result>40</result>