The students watered the flowers, 42 people in the first class, 12 pots of flowers per person, 38 people in the second class, 15 pots of flowers per person. How many more pots of flowers does the second class water than the first class?
同学们浇花，一班42人，每人浇花12盆，二班38人，每人浇花15盆．二班比一班多浇花多少盆？
<gadget id="calculator">15 * 38</gadget>
<output>570</output>

<gadget id="calculator">12 * 42</gadget>
<output>504</output>

<gadget id="calculator">570 - 504</gadget>
<output>66</output>

<result>66</result>