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A spherical metallic shell with 6 cm ext...

A spherical metallic shell with 6 cm external radius weighs 6688 g, What is the thickness of the shell if the density of metal is 10.5 g per `cm^3` (take `pi= 22/7`)
6 सेमी के बाहरी त्रिज्या के साथ एक गोलाकार धात्विक शैल का वजन 6688 ग्राम है, यदि धातु का घनत्व 10.5 ग्राम प्रति सेमी है तो शेल की मोटाई क्या है? (मानिए `pi= 22/7`)

A

2 cm

B

3 cm

C

`2 1/2` cm

D

4 cm

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