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Solve This - Education - Nairaland

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Solve This by Zuru1(op): 7:21pm On Nov 01, 2017
during one year in a school 5/8 of the students had measles, 1/2 had chicken pox and 1/8 had neither. what fraction of the school had both measles and chicken pox



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Re: Solve This by Sugar97(f): 3:41am On Nov 02, 2017
Let the fraction of those who had both be X

Then 5/8 + 1/2 + 1/8 - X = 1
(Since there are only 4 possible outcomes viz. Only measles,, only chicken pox, neither and both)

Now solve for X, that should be easy cool
Add all like terms on LHS to have
5/4 - X = 1
X = 5/4 - 1 = 1/4

Therefore, the fraction of those who had both diseases is 1/4
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