How many amendments does the U.S. Constitution have?

What does this answer mean?

The U.S. Constitution has 27 amendments. An amendment is a formal change or addition, made through the process in Article V: approval by two-thirds of both houses of Congress, or a convention requested by the states, and then ratification by three-fourths of the states.

The first ten amendments were ratified together in 1791 and are known as the Bill of Rights. The other 17 came over the next two centuries. Several appear elsewhere on the civics test: the 14th Amendment defines who is a citizen, the 15th and 19th protect the right to vote, and the 22nd limits a president to two elected terms.

The most recent, the 27th, was first proposed in 1789 but not ratified until 1992. It says a change in pay for members of Congress can't take effect until after the next House election.

This is one of the 20 questions on the 65/20 list. At the interview, say "twenty-seven."