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Mathematics 22 Online
OpenStudy (anonymous):

Just making sure this is right: 50% = .5 , 1/20= .05, 1/10= .1, and then 70. .5+.05+.1=65 , 100-65=35 70/.35= 200, 200*.05= 10 kids are 10. It wants to know how many 10 years there are.

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