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A hollow iron pipe is 21 cm long and its external diameter is 8 cm. If the thickness of the pipe is 1 cm and iron weighs 8 g/cm3, then the weight of the pipe is: | |
A. | 3.6 kg [Wrong Answer] |
B. | 3.696 kg [Correct Answer] |
C. | 36 kg [Wrong Answer] |
D. | 36.9 kg [Wrong Answer] |
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