WEST LAFAYETTE—Terone Johnson scored 22 points to help Purdue defeat Northwestern 74-43 on Sunday night and snap a three-game losing streak.D.J. Byrd scored 13 points and Ronnie Johnson and Rapheal Davis added 10 each for the Boilermakers (13-14, 6-8 Big Ten), who shot 53 percent from the field and outrebounded the Wildcats 48-23. It was the second-largest victory margin of the season for Purdue and the worst loss of the season for NU. Purdue had lost five of six, and its last three losses had come by a combined 61 points. The Boilermakers were coming off an embarrassing 83-55 loss to No. 1 Indiana, and they had eight days to think about it.Tre Demps led Northwestern with nine points. Reggie Hearn, who scored 26 in Northwestern’s 75-60 win on Feb. 2, finished with eight. Northwestern (12-15, 5-9) has lost its past three games, all by 20 or more points.