Friday, May 22, 2015

#Solve #Puzzle

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.
3.696 kg
C.
36 kg
D.
36.9 kg
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