The length of a cold storage is 5 times its breadth, and its height is 8 m. The area of its four walls (including the doors) is 720 m2 . Find the total surface area of cold storage
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 1282.5 m2
Given that
The length of the cold storage = 5 × the breadth of the cold storage
l = 5b
Height of the cold storage h = 8m
The area of its four wall = 2(l + b) × h = 720
2 × (5b + b) × 8 = 720
6b = 45
b = 45/6 m = 7.5 m
l = 5b = 225/6 m = 37.5 m
The total surface area of cold storage = 2 ( lb + bh + hl)
= 2 × (37.5 × 7.5 + 7.5 × 8 + 8 × 37.5)
= 2 × 641.25 = 1282.5 m2