Robby doesn't like the color brown and will not eat the brown M&M's.  On his first bag, he sets aside  9 brown M&M's.  On the second bag, he sets aside 12.  On his third & fourth bag, there are 8 brown M&M's that he doesn't eat. On his fifth bag, there are only 3 brown M&M's that he doesn't eat.  What's the average number of brown M&M's in a bag?
Out of 5 bags, he had 9+12+8+8+3 = <<9+12+8+8+3=40>>40 brown M&M's
He ate 5 bags so the average number of brown M&M's per bag was 40/5 = <<40/5=8>>8 brown M&M's
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