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06-02-2017
Mathematics

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Laura is four years less than twice her son's age. The sum of their ages is 119. How old is Laura? How old is her son?

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MathisLif3 MathisLif3

06-02-2017

L=Laura's age, S=sons age
L=2s-4
L+S=119
=> L=119-S
119-S = 2s-4
119+4=3s
123=3s
s=41 implies L=78
78+41=119
and 78=2*41-4
therefore Laura is 78 and her son is 41

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