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Question

Question 4
The paint in a certain container is sufficient to paint an area equal to 9.375 m2. How many bricks of dimensions 22.5 cm×10 cm×7.5 cm can be painted out of this container?

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Solution

Total surface area of one brick = 2(lb + bh +hl)
=[2(22.5×10+10×7.5+22.5×7.5)] cm2
=2(225+75+168.75)cm2
=(2×468.75)cm2
=937.5 cm2

Let n bricks can be painted by the paint of the container.
Area of n bricks
=(n×937.5)cm2=937.5n cm2
Area that can be painted by the paint of the container
=9.375m2=93750 cm2
93750=937.5n
So, n = 100

Therefore, 100 bricks can be painted out by the paint of the container.

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