Your answer, "He bought a field", is not correct.
The correct answer to
What did Judas do with his 30 pieces of silver?
is
He returned it to the priests
as shown by
Matthew 27:3-5
which is
- KJV
- [3] Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, [4] Saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? see thou to that. [5] And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.
- NIV
- [3] When Judas, who had betrayed him, saw that Jesus was condemned, he was seized with remorse and returned the thirty silver coins to the chief priests and the elders. [4] "I have sinned," he said, "for I have betrayed innocent blood." "What is that to us?" they replied. "That's your responsibility." [5] So Judas threw the money into the temple and left. Then he went away and hanged himself.