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Marcus is $49$ years old Sydney is the age of $34$ years old how many years ago was Marcus age $2$ times Sydney's age.

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    not a differential equation. – 2017-02-21

1 Answers 1

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Let x years ago.

Then we have,

49 - x = 2(34 - x)

49 - x = 68 - 2x

x = 19.

So 19 years ago.