a) 16 m
b) 18 m
c) 20 m
d) 32 m
Answer: a
Explanation: Let the height of the room be x metres
Then, breadth = 2x metres and length = 4x metres
Volume of the room :
= (4x × 2x × x) m3
= (8x3) m3
8x3 = 512
x3 = 64
x = 4
Length of the room is :
= 4x
= (4 × 4)
= 16 m
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