How many teaspoons are equivalent to one tablespoon?

##3##, except in Australia, where it is ##4##
In the metric system, in milliliters, we have:
##1 xx “teaspoon” = 5 “ml”##
##1 xx “tablespoon” = 15 “ml”## (except in Australia).
So:
##(1 xx “tablespoon”)/(1 xx “teaspoon”) = (15 “ml”)/(5 “ml”) = 3##
In Australia, they define a tablespoon as ##20 “ml”##, which makes ##4## teaspoons to the tablespoon.
In the USA, a tablespoon is also ##3## teaspoons, but both are slightly smaller.