A) 5
B) 7
C) 21
D) 35
Correct Answer: C
Solution :
Let the height of each floor be x unit \[\therefore \,\,\sqrt{3}\,=AB=OA-OB\] \[\Rightarrow \,\sqrt{3}=x\cot \,{{30}^{0}}\,-2x\,\cot \,{{60}^{0}}\] \[\Rightarrow \,x=3\] Height of building = 7(3) = 21 unitsYou need to login to perform this action.
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