In a foreign country, half of 5 = 3. based on that same proportion, what's one-third of 10?

If the rule is to round the result to the closest number, by going up, then 10/3 = 4.
But if the rule is to round to the closest number, and with the convention that if we have an equality, we chose the upper solution, then 10/3 = 3.

The mode of the numbers is 29.