Nissa o hirile babereki ba nakwana ba le 60 go tla go tshameka jaaka ma-elf kwa lefelong la ga Santa mo lebenkeleng la gagwe. Nngwetharong ya ma-elf e a tlogela morago ga gore bana ba tlhatse mo go ona, mme morago ga foo ba le 10 ba ba setseng ba a tlogela morago ga gore bana ba ba kgotle mo mangoleng. Go setse ma-elf a makae? 

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?
Sa pele, kgaoganya palo ya ma-elf a a simolotseng ka 3 go bona gore ke a makae a a tlogetseng morago ga go tlhatsiwa, e leng ma-elf a le 60 / 3 = <<60/3=20>>20.
Morago ga foo, ntsha palo eo mo palong ya ma-elf a a simolotseng go bona gore go setse a makae: ma-elf a le 60 - ma-elf a le 20 = <<60-20=40>>40.
Morago ga foo, ntsha palo ya ma-elf a a tlogetseng morago ga go kgotswa go bona palo ya botlhe ba ba setseng: ma-elf a le 40 - ma-elf a le 10 = <<40-10=30>>30.
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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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