In the hexagon PQRSTUPQRSTUPQRSTU, four of the interior angles are P=112∘P = 112^\circP=112∘, Q=124∘Q = 124^\circQ=124∘, T=131∘T = 131^\circT=131∘, and U=143∘U = 143^\circU=143∘.
The remaining two interior angles are related such that angle QRS=2×QRS = 2 \timesQRS=2× angle RSTRSTRST.
Work out the size of angle QRSQRSQRS.
