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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?

Sagot :

MsARMY
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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