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Rhinos and Triceratops Counting

925BeginnerSystems Of EquationsAlgebra

Berkeley Math Circle: Monthly Contest 2

You are out walking and see a group of rhinoceroses (which each have two horns and four legs) and triceratopses (which each have three horns and four legs). If you count 31 horns and 48 legs, how many triceratopses are there?
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