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Olympiad-Math
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Class 9
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Surface Areas and Volumes
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Q)
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
( B ) 36 kg
( C ) 3.696 kg
( D ) 36.9 kg
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