Question 183

The paint in a certain container is sufficient to paint an area equal to 9.375 m . How many bricks measuring 22.5 cm by 10 cm by 7.5 cm can be painted out of this container?

Solution

Length of a brick = 22.5 cm

Breadth = 10 cm

Height = 7.5 cm

Total surface area of 1 brick = 2 * $$(lb + bh + hl)$$

= 2 * (22.5*10 + 10*7.5 + 7.5*22.5)

= 2 * (225 + 75 + 168.75) = 2 * 468.75

= 937.5 $$cm^2$$

Number of bricks that can be painted = $$\frac{9.375*100*100}{937.5}$$ = 100

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