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Answer:
The polar bear weighs 525kg
Step-by-step explanation:
C = Polar Bear
D = Baby Elephant
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(1) C + D = 700 kg
(2) C = 3D
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C = 700 - D
700 - D = 3D
700 = 4D
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525 + 175 = 700
Then we get our answer, the polar bear weighs 525kg, and the baby elephant weighs 175kg.
Hope this helps you :)