Question

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

Answer 1

Total surface area of a brick=2(lb+ bh+ lh)
=2(22.5 X10+10X7.5+22.5 X7.5)
=2(225+75+168.75)
=450+150+337.5
=937.5cm²/10000
=0.09375m²

now
no. of bricks = 9.375m²/0.09375m²
=100

Answer 2

Question :-

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

Answer :-

Total surface area of one brick

⠀⠀= 2(lb+bh+lb)

⠀⠀=[2(22.5×10+10×7.5+22.5×7.5)]${cm}^{2}$

⠀⠀= [2×468.75]${cm}^{2}$

⠀⠀= 937.5${cm}^{2}$

Let ,n brick's can be painted out by the paint of container.

Area of n brick's

= (n×937.5cm) = 937.5n${cm}^{2}$

Area painted of the container

⠀⠀⠀= 937.5${cm}^{2}$

⠀⠀⠀= 93750${cm}^{2}$

So , we have 93750 = 937.5n

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀n = 100

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