In week 13, the Lions visited the Baltimore Ravens. The Ravens opened the scoring in the first quarter via a 38-yard field goal from Justin Tucker. The Ravens added 17 points in the second quarter via a one-yard touchdown pass from Joe Flacco to Benjamin Watson, a three-yard touchdown pass from Flacco to Patrick Ricard, and a 46-yard field goal from Tucker, giving the Ravens a 20-0 lead at the intermission. After half-time, the Lions finally got on the board and scored 13 points in the third quarter via a four-yard touchdown run from Theo Riddick, and a six-yard touchdown run from Tion Green (the first of his career), reducing the Ravens' lead to seven points. The Ravens responded with 24 points in the fourth quarter via a seven-yard touchdown run from Alex Collins, a 51-yard field goal from Tucker, a six-yard touchdown run from Collins, and a 45-yard interception return from Eric Weddle. The Lions scored via a one-yard touchdown pass from Matthew Stafford to Nick Bellore, making the final score 44-20 in favor of Baltimore.
Question: How many points were scored in the first half?
Answer: 20