The students watered the flowers, there were 42 people in a class, and each person watered 12 pots of flowers. There are 40 people in the second class, and each person waters 13 pots of flowers. Which class waters more flowers? How many pots?
同学们浇花，一班42人，每人浇花12盆．二班40人，每人浇花13盆．哪个班浇的花多？多几盆？
<gadget id="calculator">40 * 13</gadget>
<output>520</output>

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

<gadget id="calculator">520 - 504</gadget>
<output>16</output>

<result>16</result>