Question

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?


and


A cubical box has each edge 10 cm and another cuboidal box is 12.5 cm long, 10 cm
wide and 8 cm high.
(1)Which box has the greater lateral surface area and by how much?
(2) Which box has the smaller total surface area and by how much?​

Answer 1

ANSWER:

Volume of paint = 9.375 m2 = 93750 cm2

Dimension of brick = 22.5 cm×10 cm×7.5 cm

Total surface area of a brick = 2(lb + bh + lh) cm2 

= 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

Number of bricks can be painted = 93750/937.5 = 100

HOPE IT WILL HELP YOU.