There are 15 children releasing balloons, and each of them has 12 balloons in each hand. How many balloons are there in total?
有15个小朋友放气球，他们每人每只手里都有12个气球．一共要放多少个气球？
<gadget id="calculator">12 * 15 * 2</gadget>
<output>360</output>

<result>360</result>