The Patriots faced the St. Louis Rams in London in a rematch of Super Bowl XXXVI. This time, the matchup proved lopsided. After receiving the opening kickoff, short passes to Steven Jackson and Austin Pettis moved the ball to the Rams 44. Next, back-to-back Jackson rushes moved the ball to midfield. On the next play Sam Bradford threw a 50-yard touchdown strike to Chris Givens for a 7-0 lead. The Rams wouldn't score again. The Patriots countered on their next drive, marching 77 yards in 8 plays, scoring on a 19-yard touchdown pass to Lloyd. Brady extended his streak of consecutive games with a touchdown pass to 40 behind Johnny Unitas and Drew Brees. After a Rams punt, the Patriots marched 84 yards in 9 plays, scoring on a 1-yard touchdown run by Vereen on 4th-and-goal. After another punt the Patriots began to put the game away. Taking over at their own 22, aided by a 32-yard screen to Gronkowski on 3rd-and-4, the Patriot raced 78 yards in 9 plays with Brady throwing a 7-yard touchdown pass to Gronkowski, increasing the lead to 21-7. Gronkowski celebrated the touchdown by acting like a castle guard before spiking the ball. The Rams drove to the Patriots 35 on their next drive, but attempted a fake field goal that resulted in a 9-yard loss. The Patriots wasted no time, racing 56 yards in 9 plays, scoring on a 1-yard touchdown run by Ridley with just&#160;:10 seconds left in the half. Bradford took a knee and the game went to halftime with the Patriots winning 28-7. The Patriots continued to speed up against a tired Rams defense in the second half. Taking the opening drive, the Patriots raced 80 yards in just 6 plays with Brady throwing a 9-yard touchdown pass to Lloyd, blowing the game open 35-7.  The Rams offense continued to show no signs of life, going three-and-out again and he Patriots took advantage, driving 58 yards to the Rams 35 and Gostkowski increased the lead to 38-7 on his 53-yard field goal. After both teams punted on their next drive, the Rams drove to the Patriots 41, but turned the ball over on downs. The Patriots moved quickly again, driving 55 yards and scoring on Brady's 14-yard touchdown pass to Gronkowski. With the game out of reach, the Rams drove to the Patriots 25 on their next drive, but Dennard intercepted Bradford at the 4 and returned it 8 yards to the 12. The Patriots punted on their next drive, and the Rams responded by driving to the Patriots 15, but Tavon Wilson intercepted Kellen Clemens at the 1-yard line and returned it 45 yards to the Patriots 46. Ryan Mallett took three knees and the game was over. Brady threw for 304 yards and 4 touchdowns, 2 each to Lloyd and Gronkowski. The Patriots improved to 2-0 in games played in London, having defeated the Tampa Bay Buccaneers there in 2009. With the huge win, the Patriots went into their bye week at 5-3, but only 1-2 against the NFC West.
Question: How many points were the Patriots winning by at halftime?
Answer: 21