Read this article and answer this question Hoping to build on their surprising victory over the Jaguars, the Texans flew to LP Field for an AFC South showdown with the Tennessee Titans.  After a scoreless first quarter, the Texans trailed early, as Tennessee QB Vince Young ran 20 yards  for a touchdown.  Houston would respond with kicker Kris Brown nailing a 27-yard field goal.  However, things started getting ugly as Titans DE Tony Brown returned a fumble 40 yards for a TD.  In the third quarter, QB David Carr lasted for only one drive, which resulted in a fumble recovery for Tennessee.  He would be replaced with back-up QB Sage Rosenfels.  However, a Rosefels interception resulted in Young completing a 20-yard TD pass to WR Bobby Wade.  The Texans would respond with Rosenfels completing a 10-yard TD pass to WR Andre Johnson.  In the fourth quarter however, CB Pacman Jones returned a punt 53 yards for a touchdown.  Houston would try to retaliate, as Rosenfels completed two touchdown passes (a 1-yarder and a 2-yarder to rookie TE Owen Daniels), but in the end, any hope for a comeback resulted in a fumble, dropping the Texans to 2-5.
How many touchdown plays were exactly 20 yards?
2