Question

If the area of 4 walls of the hall whose breadth is 15 m and height is 8 m is $1068m^2$ then the length of the hall is

• A. 18 m
• B. 17 m
• C. 16 m
• D. none of these

Answer 1

The correct option is D none of these

Given the area of four wall of the hall is 1068 sq cm and breadth 15 m and height is 8 m and let the length is x cm

The area of four wall of hall =2(l+b)h=2(x+15)8

But area of four wall given 1068 sq m

$2(x+15)8=1068\Rightarrow x+15=\frac{1068}{16}\Rightarrow x=66.75-15=51.75$ cm

the length is 51.75 cm