How many amendments does the Constitution have?

Why this is the answer

The count is twenty-seven. Ten of them arrived together in 1791 as the Bill of Rights, and seventeen more have been added since. The most recent one, the 27th, was added in 1992 and explains how senators and representatives are paid. It has an odd history: Congress first discussed it back in 1789, as one of the amendments considered for the Bill of Rights, and it waited two centuries to be adopted. If you are asked this question and hesitate, count from the two parts you already know: the ten of the Bill of Rights plus the seventeen that came later. Memory hook: ten at the start, seventeen since, twenty-seven in total.