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Granny's Age

Stage: 3 and 4 Short 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?


If you liked this problem, here is an NRICH task that challenges you to use similar mathematical ideas.


This problem is taken from the UKMT Mathematical Challenges.

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