Question

The length of room is double of its breadth and room is of 3m high . if the surface area of all four wall is 90m^2 then find its length and breadth​

Answer 1

Answer:

b = 5m and l = 10m

Step-by-step explanation:

Surface area of four walls = Lateral surface area = 2h (l+b)

Given, Surface area = 90m², h = 3m, l = 2b.

=> 90 = 2 × 3 × (2b+b)

=> 90 ÷ 6 = 3b

=> 3b = 15

=> b = 15 ÷ 3

=> b = 5m

Therefore, Breadth = 5m.

Length = 2×5 m = 10m