In triangle PQR, points A, B, C are the midpoints of line PQ, line PR and line RQ respectively

1. If BC = 7, then PQ = __

2. If QR = 12, then AB = __

3. If AC = 3x + 5, PR = 4x + 16, then PR = __

4. If AB = 7x – 4, QR = 3x + 14, then QC = __

5. If AB = 15, AC = 19, then QR + PR = __

6. If QA = x + 4,PA =2x- 5, then BC = __

7. If QP = 20, QR =18, then BC + AB = __

8 . If QP +PR +RQ = 60, then BC +AC+ AB = __