Question

the area of four walls of room is 150m^2. If the length of the room is twice its breadth and the height is 4m, find the area of the floor -answer is 78.125

Answer 1

Given: area of 4 walls=150m^2, height= 4m
let the breadth be b
length = 2b
area of 4 walls = 2(l+b)×h
150 = 2(2b+b)×4
150/2 = 3b×4
75= 12b
b= 75/12
b= 6.25 m
l= 2b
l= 2*6.25
l= 12.5 m
area of floor = l× b
area of floor = 12.5 × 6.25 =78.125m^2

Answer 2

Please Watch out pic. I've solved in it.