The figures below show a quadrilateral and a triangle with angle measures as marked.
1. What is the value of 1/4 (t + u + r + s) - 1/3 (s + t + u)? #SATprep ACTprep
2. What is the value of 1/4 (a+b+c+d) - 1/3 (s + t + u) ?
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