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  • 20-02-2015
  • Mathematics
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apologiabiology
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  • 20-02-2015
so megan is four years younger than her aunt

m+4=a
or
m=a-4
the sum of their ages is at least 40
m+a>40
subsitute a-4 for m
a-4+a>40
combine like terms
2a-4>40
the answer is the third from the top
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