Q. The external and the internal radii of a hollow right circular cylinder of height 15 cm are 6.75 cm and 5.25 cm respectively. If it is melted to form a solid cylinder of height half of the orignal cylinder, then the radius of the solid cylinder is

A) 7.25 cm

B) 6 cm

C) 7 cm

D) 6.5 cm

✔ Correct Answer: 6 cm

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