[Aryan Jain]

i ) x -11 = 7

x = 11 + 7

x = 18

ii ) z + 8 = 9

z = 9 – 8 = 1

iii ) 11x = 121

x = 121 / 11 = 11

[Aryan Jain]

Assuming the room as a cuboid,

Volume = length * breadth * height = 800 m^3 (given) (1)

Area of floor = length * breadth = 320 m^2 (given) (2)

Comparing the above two equations, dividing (2) from (1),

Height = 800 / 320 = 10 / 4 = 2.5 m

[Aryan Jain]

Length of boundary of the part = 288 m (given)

Length of boundary = circumference of semi circle + diameter = pie * radius + 2 * radius

Radius * ( pie + 2 ) = 288

Radius = 288 / ( 22/7 +2 )

= 288 / ( 36/7 )

= 288 * 7/36

= 8* 7 = 56 m

Area of circle = pie * r^2 = 22/7 * 56 * 56 = 22 * 8 *56 = 9856 m^2