Regifting Robin / How Do She Do It?

Regifting Robin ^ | 03/12/2009 | Regifting Robin

[Dallas59]

Choose any number, then subtract both the first and second digits from your number.
Example: 25-2-5=18...

[Dallas59]

I can't fool her...

[Paladin2]

Didn’t work. Here The Force is weak.

[gusopol3]

your subtraction’s bad.

[rawhide]

If you look carefully, all the numbers have the same gifts each time, after you do the math.

[Paladin2]

No, my mouse pointing skillz are weak too.

[Dallas59]

[gusopol3]

a happy face mug has nine lives

[JennysCool]

Robin just got a great gig — Obama put her in charge of gifts for foreign dignitaries.

[rawhide]

Choose the number 10 from this chart, and then do the math. You will see the gift is a ‘Happy Face Mug’. Now choose any other two-digit number on this chart, and the gift will also be a ‘Happy Face Mug’.

[rawhide]

Now choose any other two-digit number on this chart, and the gift will also be a ‘Happy Face Mug’.

Added: After you do the math.

[Mr. Know It All]

OK, you have a number N which is made up of digits X and Y so:

N = 10X + Y

Now, you subtract X and Y from N to get a new number G (for gift!):

G = N - X - Y = (10X + Y) - X - Y = 9X

So, whatever two-digit number you pick, you’ll end up with a result that is a multiple of 9. If you look at the chart that someone posted, every give with a number that is a multiple of 9 (e.g. 9, 18, 27, 36, 45...) is the same.

[ReleaseTheHounds]

Didn’t work for me (84)...