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Weekly Problem 10 - 2015

Stage: 3 and 4 Challenge Level: Challenge Level:1

Granny swears that she is getting younger. She has calculated that she is four times as old as I am now, but remembers that $5$ years ago she was five times as old as I was at that time.

What is the sum of our ages now?

This problem is taken from the UKMT Mathematical Challenges.

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