A rectangular block of wood having dimensions 3m X 2m X 1 75 m has to be painted on all its faces Th...........

Quantitative Aptitude (CDS) Mensuration 3D

A rectangular block of wood having dimensions 3m X 2m X 1.75 m has to be painted on all its faces. The layer of paint must be 0.1 mm thick. Paint comes in cubical boxes having their edges equal to 10 cm. The minimum number of boxes of paint to be purchased is

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Explanation:

Surface area of the rectangular block of wood=2(3×2+2×1.75+1.75×3)=29.5m²
Therefore, volume of the paint required for painting 0.1 mm thick layer =29.5 x 0.1/1000 = 0.00295m³
Volume of each cubical box =(10/100)³=0.001m³
Therefore, number of boxes required = 0.00295/0.001=2.95
Thus, the minimum number of boxes of paint required is 3