To celebrate the "June 1st" event, the kindergarten bought back 400 prizes and distributed them to 12 classes, leaving 16 prizes left. How many prizes are awarded per class on average? (Please list the comprehensive formula and calculate)
庆"六•一"活动，幼儿园买回400份奖品，分给12个班，还剩下16份．平均每班分得奖品多少份？(请列综合算式并计算)
<result>12</result>