The little white rabbit and the little black rabbit went to the forest to pick some carrots, and they divided the carrots equally when they got home. The little white rabbit ate 4 carrots that day, and the little black rabbit ate 12 carrots in one go. The little white rabbit will eat 4 carrots every day from then on; the little black rabbit will only eat 2 carrots every day because he ate too much on the first day, and they both finish their own carrots at the same time. How many carrots did the little white rabbit and the little black rabbit pick together?
小白兔与小黑兔一块去森林里采摘了一些胡萝卜，回家后它们就把胡萝卜平分了．小白兔当天吃了4个胡萝卜，小黑兔则一口气吃了12个胡萝卜．小白免往后每天都吃4个胡萝卜；小黑兔因为第一天吃得太多，往后每天只吃2个胡萝卜，最后它俩同时把自己的胡萝卜吃完．小白兔与小黑兔一共采摘了多少个胡萝卜？
<result>40</result>