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

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 = __

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