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$8\frac{3}{4}+10\frac{2}{5}\\=\frac{35}{4}+\frac{52}{5}\\=\frac{(35×5)+(52×4)}{20} \\=\frac{175+208}{20}\\=\frac{383}{20} \\=19.15 =19\frac{3}{20}$