In the team class, the students had a balloon blowing competition. Wang Gang blew 12 balloons in 3 minutes. According to this calculation, if he blows for another 2 minutes, how many balloons can he blow up in total?
班队课上同学们进行吹气球比赛，王刚3分钟吹了12个气球．照这样计算，他再吹2分钟，一共可吹几个气球？
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 + 12</gadget>
<output>20</output>

<result>20</result>