Nissa hires 60 seasonal workers to play elves in her department store's Santa village. A third of the elves quit after children vomit on them, then 10 of the remaining elves quit after kids kick their shins. How many elves are left?
First, divide the starting number of elves by 3 to find out how many quit after being vomited on, which is 60 elves / 3 = <<60/3=20>>20 elves.
Then subtract that number from the starting number of elves to find out how many are left: 60 elves - 20 elves = <<60-20=40>>40 elves.
Then subtract the number of elves who quit after being kicked to find the total number who left: 40 elves - 10 elves = <<40-10=30>>30 elves.
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