Santa Claus Solution
The steps you can take to solving this problem are,
1. Add up the fractions of his life hes worked at different jobs.
1/3 + 1/4 + 1/5 = 47/60
2. Subtract the numerator of the fraction, which was 47, from the denominator, which was 60, and youll get 13.
60-47 = 13
Then you know the fraction that Santa Claus had been Santa Claus, 13/60 of his working life.
3. Now if Santa Claus has been Santa Claus for 13 years then the fraction for 13 years of his working life is 13/60. You can add up all the fractions except for a missing one and you get a fraction. For example,
1/4 + 1/5 + 13/60 = 40/60.
Now you can subtract the numerator from the denominator of the fraction and get the amount of years hes worked at that missing job. So you subtract 60 - 40 = 20 which is 1/3 of his life at work and you have the amount of years hes worked as a school caretaker.
4. You can add up the total amount of years worked and add the fifteen years he hadnt worked as a youth, then youll have his age.
Santa Claus is 75 years old.
Click here to go back to the problem "How Old is Santa Claus?"