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Three red rods are 2cm longer than two blue rods. Three blue rods are 2cm longer than four red rods. How long is each rod?
3r = 2b + 2 b = (3/2)r - 1 "Three blue rods are 2 cm longer than four red rods" 3b = 4r + 2 3[(3/2)r - 1] = 4r + 2 (9/2)r - 3 = 4r + 2 (1/2)r = 5 r = 10 cm b = (3/2)(10 cm) - 1 b = 14 cm
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