Aunt Wang brought 990 yuan to buy fertilizer. I bought 25 bags of chemical fertilizers, leaving 40 yuan. How much is each bag of fertilizer?
王大妈带了990元钱买化肥．买了25袋化肥，剩下40元．每袋化肥多少元？
<gadget id="calculator">990 - 40</gadget>
<output>950</output>

<gadget id="calculator">950 / 25</gadget>
<output>38</output>

<result>38</result>