Answer :

Banabanana
PQ + QR = PR 
9x + 11x - 18 = 19x - 6 
20x - 18 = 19x - 6
20x - 19x = -6 + 18
x = 12

QR = 11x - 18 = 11*12 - 18 = 132 - 18 = 114

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