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An ostrich at the zoo weighs 3 times as much as Mark’s pet dog. Together the ostrich and the dog weigh 448 pounds. How much does the ostrich weigh?

A. 149 pounds

B. 112 pounds

C. 224 pounds

D. 336 pounds

1 answer

O = 3 D

O + D = 448

substituting ... 3 D + D = 448

solve for D , then substitute back to find O

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