Question

the length of a room is twice its breadth and height is 4 metre less than breadth if the total surface area of walls for roof is 560 CM square find its dimensions ​

Answer 1

Step-by-step explanation:

let the breath be x

then the length b2x and

height is X - 4 .

area of four wall = 560 cm2

2 × h (l+b) = 560

2× (x-4)(2x+x) = 560

6x (x-4) = 560

6x2 - 24x = 560

3x2- 12x = 280

3x2- 12x-280

x = 12+_4 under root 219/6