There are 218 girls in the third grade, and 12 boys are twice as many as girls. How many boys are there?
三年级有女生218人，男生比女生的2倍少12人，男生多少人．
<gadget id="calculator">218 * 2</gadget>
<output>436</output>

<gadget id="calculator">436 - 12</gadget>
<output>424</output>

<result>424</result>