if you wonder what those tiny lines are on the lines, those are just tickmarks, and they're just saying that RO = OQ, and NO = OP.
we know RO = 6+x, and that OQ = 2x + 1, then 6+x = 2x+1, that simply leaves us with 5 = x.
RO = 6 + 5 = 11.....................OQ = 2(5) + 1 = 11, they're twins anyway, and RQ is simply 11 + 11 = 22.