John Gill Commentary 2 Kings 14:17

"And Amaziah the son of Joash king of Judah lived after the death of Jehoash son of Jehoahaz king of Israel fifteen years." — 2 Kings 14:17 (ASV)

And Amaziah the son of Joash king of Judah lived after the
death of Jehoash son of Jehoahaz king of Israel fifteen years .
] Which, with the fourteen he reigned contemporary with him, made the twenty nine years he reigned, (2 Kings 14:2) . The Vulgate Latin version is, "twenty five years".