Area of 4 walls of a cuboid is 448 sq cm, its length is 18 c

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Area of 4 walls of a cuboid is 448 sq cm, its length is 18 cm and height is 8 cm. What is its breadth (in cm)?

[2017 SSC CGL 18 AUG Shift-1]

A 10

B 9

C 8

D 7