Please tell me-wht rational is used to solve this riddle?how do we get the

[crackpot06]

answer given at the end of riddle? First of all, pick the number of days a week that you would like to eat out.
Multiply this number by 2.
Add 5.
Multiply it by 50 [I'll wait while you get the calculator].
If you haven't had your birthday this year, add 1749. If you haven't, add 1748.
Now, subtract the four digit year that you were born.
Answer--The first digit was your original number [# times you want to eat out each week]. The second two digits are your age.