[Solved] The sum of the ages of two cousins is 15.

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The sum of the ages of two cousins is 15. In 3 years, the older cousin will be twice as old as the younger cousin.

The sum of the ages of two cousins is 15. In 3 years, the older cousin will be twice as old as the younger cousin. How old is the older cousin now?

Answer is 11 year old. how do I get this answer?

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