(2X + 5 ) x 50 + 1754 =100X + 250 + 1754

Notice that the constants 250+1754 make 2004 – which is this year

Now you will either have been born in the 1900’s or in the 2000’s so subtracting the four digit number of your year of birth from 2004 leaves you with your age (in the last two columns).

We have not dealt with the 100X. By multiplying the single digit number X by 100 it places it in the 100’s column. This means that the digit in the 100’s column will not be zero (2004) but your age and will remain after you subtract the year of birth)

or

(2X + 5 ) x 50 + 1753 = 200X +250+1753 -

Notice that the constants 250+1754 make 2003 – which is the year you had your last birthday

Now you will either have been born in the 1900’s or in the 2000’s so subtracting the four digit number of your year of birth from 2003 leaves you with your age (in the last two columns).

We have not dealt with the 100X. By multiplying the single digit number X by 100 it places it in the 100’s column. This means that the digit in the 100’s column will not be zero (2004) but your age and will remain after you subtract the year of birth)