How old am I? Poster
How Old Am I? Poster
This poster is based on the problem How Old Am I?.
The poster is available as a PDF, or the image below can be clicked on to enlarge it.
21
Why?
Image
Adding 30 to the age 15 years ago is the same as squaring it
Number | Square | Difference |
---|---|---|
3 | 9 | 6 |
4 | 16 | 12 |
5 | 25 | 20 |
6 | 36 | 30 |
7 | 49 | 42 |
The difference keeps getting bigger so 6 is the only solution
I was 6 15 years ago, so now I am 21