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10-04-2017
Mathematics

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Four times marie's age minus twice lisa's age is -10. lisa is three times as old as marie. how old is marie?

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10-04-2017

Marie is 5 years old

4m - 2l = -10 ------- x
l = 3m ---------------- y

sub y into x
4m - 2(3m) = -10
4m - 6m = -10
-2m = -10
m = -10/-2
m = 5 years old

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