How many shekels of silver did Jeremiah pay for his cousin Hanamel's field?

Answer: Seventeen

Jeremiah bought the field in Anathoth for seventeen shekels as a sign that "fields… will again be bought in this land."

“So I bought the field in Anathoth from my cousin Hanamel, and I weighed out seventeen shekels of silver.”— Jeremiah 32:9 (BSB)