There's no secret tip that will crack this calculation.
Start by making a good guess where the line falls, then add up the numbers in the two halves.
UK Version
There's no hidden trick to this puzzle - it's pure calculation.
First, make an educated guess at where the line falls, then add up the numbers in the two halves.
US Version
Consider this! The sum of all the numbers around the whole circle is 78.
So if the sum on each half of the clock is equal, what is half of 78?
UK Version
Consider this: the sum of all the numbers around the whole clock is 78.
If the sum on each half of the clock is equal, what is that number?
US Version
If the sum of all the numbers is 78, then the total of each half is 39.
Make a rough guess where that dividing line might be, then add up each half.
Adjust the line based on how far away each half is from 39.
UK Version
If the sum of all the numbers is 78, then the total of each equal half is 39.
Make a rough guess where that dividing line might be, then add up each half. Adjust the line based on how far each total is from 39.
US Version
It all comes down to math once you know the secret that each half must add up to 39.
Keep making a good guess where the crack might be until each half hits that number!
UK Version
You know that each half must add up to 39. Now it just comes down to arithmetic - there's no way round it.
If you can't get the answer by guessing, you'll just have to work through all the combinations until you find one where the numbers on each half of the clock add up to 39.
Solution
Incorrect
US Version
Too bad!
Try again. It's a matter of careful calculation...
UK Version
Too bad.
Try again. It's a matter of careful calculation...
Correct
Precisely!
The clock face split in a line between 9 and 10 on the left and 3 and 4 on the right.