Task: Question Answering
Input (English): Passage: After a tough opening loss to the St. Louis Rams, the Seahawks traveled to Green Bay to take on the Packers. The Packers struck first blood, scoring the game's first 10 points. Then, the Seahawks and Packers traded field goals, and the Packers led 13-3 at halftime. The Seahawks scored two unanswered touchdowns to take a 17-13 lead in the third quarter. However, the Packers proceeded to score the final 14 points of the game and won, 27-17, sending the Seahawks to their second consecutive loss of the young season. With the loss, the Seahawks dropped to 0-2. It was the first double digit loss for the Seahawks in the Wilson era and tied their largest loss since Week 9 of the 2011 season, when they lost by 10 points to the Dallas Cowboys. 
Question: How many points were the Packers ahead by at halftime? 
Answer type: Number 
Output (English): 10.