Work Step by Step
We first identify the expression: $$PX=PZ=15 \\ YR=ZR=17 \\ QY=XY$$ Thus: $$ \left(15\right)\left(2\right)+\left(17\right)\left(2\right)+\left(2QY\right)=88 \\ 2QY+64=88\\ 2QY=24 \\ QY=12$$
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