The fifth grade participated in the mathematics competition. There are 12 girls, which is equivalent to (2/3) the number of boys participating. As a result of the competition, the number of winners accounted for 70% of the participants. How many people won the prize?
五年级参加数学竞赛，女生有12人，相当于男生参赛人数的(2/3)，比赛结果，获奖人数占参赛人数的70%，获奖的有多少人？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">12 / (2/3)</gadget>
<output>18</output>

<gadget id="calculator">12 + 18</gadget>
<output>30</output>

<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">30 * (7/10)</gadget>
<output>21</output>

<result>21</result>