Some geometry questions (:?

since PM=MR, then 6x-11=10x-51, solve for x by subtracting 6 to both sides and adding 51 to both sides you get x=10, plugging x=10 in either PM or MR you should get 49, since PM or MR is 1/2 PR, then PR=2PM or MR, since PM=MR, so PR=49*2=98