a mathematical approach:
basically this thing is telling you to guess a number (n) 1..10 where you plug it into this equation:
d = (50(2n + 5) + 1766) - y
where:
d = three-digit-number
y = birth year
n = number guessed
because of this, you can simplify the equation to:
d = 100n + 2016 - y
which is basically just saying that you're subtracting your birth year from 2016 (current year, given that you've already had your birthday) and then adding 100 times your original number to it.
for example, if i guessed 6, with my birth year being 2001, given that i already had my birthday this year, my result would be:
d = 100(6) + 2016 - 2001 or d = 615.
with this, we just have to subtract 100n from our three digit answer, d. since n will always be a multiple of 100, likewise, we can just forget the leading digit of d, which will yield our age.
