Question
Length, breadth and height of a cuboidal box are 20 cm,
15 cm, and 10 cm, respectively. It is decided to paint the whole box from outside. A can of paint consists of paint which can paint up to 25 cm2 area. Find the number of cans required to paint the box.Solution
Total surface area of box = 2 x (length x breadth + breadth x height + length x height)
= 2 x (20 x 15 + 15 x 10 + 20 x 10)
= 2 x (300 + 150 + 200) = 1,300 cm2
Therefore, required number of cans = (1,300/25) = 52
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