Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.
Example: Paragraph- Sent 1: Obama was born on August 4, 1961, at Kapiʻolani Maternity & Gynecological Hospital in Honolulu, Hawaii.
Sent 2: He is the only President to have been born in Hawaii.
Sent 3: He was born to a white mother and a black father.
Sent 4: His mother, Ann Dunham (1942-1995), was born in Wichita, Kansas, of mostly English descent, with some German, Irish, Scottish, Swiss, and Welsh ancestry. Question: How old was Obama's mother when he was born?
Example solution: 19.
Example explanation: Obama was born in 1961. His mother was born in 1942 and 1961-1942=19. Therefore, any of the following responses are considred correct: '19' and 'almost twenty'.

Problem: Paragraph- Sent 1: On a busy Friday morning in Manhattan, nine pedestrians suffered bullet or fragment wounds after police unleashed a hail of gunfire at a man wielding a .45 caliber pistol who had just killed a former co-worker.
Sent 2: The officers unloaded 16 rounds in the shadow of the Empire State Building at a disgruntled former apparel designer, killing him after he engaged in a gunbattle with police, authorities said.
Sent 3: Three passersby sustained direct gunshot wounds, while the remaining six were hit by fragments, according to New York Police Commissioner Ray Kelly.
Sent 4: All injuries were caused by police, he said Saturday.
Sent 5: One officer shot nine rounds and another shot seven.
Sent 6: Police identified the gunman as Jeffrey Johnson, 58, who was apparently laid off from his job as a designer of women's accessories at Hazan Import Co. last year.
Sent 7: Johnson, who served in the U.S. Coast Guard in the mid-1970s, had two rounds left in his pistol.
Sent 8: It holds eight, Kelly said.
Sent 9: Police identified the slain co-worker as Steven Ercolino, 41, who had apparently filed a prior complaint against his assailant, claiming that he thought Johnson would eventually try to kill him.
Sent 10: Both men had filed harassment complaints against each other in April 2011, Kelly added.
Sent 11: Ercolino was listed as a vice president of sales at Hazan Import Corp., according to his LinkedIn profile.
Sent 12: "It's not something that should happen to a loving person like that," said his brother, Paul.
Sent 13: "He's going to be so missed by everybody.
Sent 14: He was a light of so many lives.". 
Question: How many rounds had Jeffrey Johnson fired from his pistol?.

Solution: 6.