Put a row of chrysanthemums at the school gate, a total of 12 pots, and put 3 pots of roses in the middle of every 2 pots of chrysanthemums. How many pots of roses are there in total?
在校门口摆一排菊花，一共12盆，再在每2盆菊花中间摆3盆月季花，一共摆了多少盆月季花？
<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>