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UKMT Junior Kangaroo, 2017

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

Anna is $13$ years old. Her mother Annie is three times as old as Anna. How old will Annie be when Anna is three times as old as she is now?

(A) $13$ (B) $26$ (C) $39$ (D) $52$ (E) $65$

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