Question

7. Five cubes of side 3 cm each are placed side by side and stuck together to form a cuboid
If the outer surface is to be painted at 15 per cm, find the total cost of painting.
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Answer 1

Answer:

$2970

Step-by-step explanation:

Find the length of the cuboid:

Length = 3 x 5 = 15 cm

Find the breadth of the cuboid:

Breadth = 3 cm

Find the area of the top and bottom:

Top = 15 x 3 = 45 cm²

Top and Bottom = 45 x 2 = 90 cm²

Find the lateral surface area:

Lateral surface area = Perimeter x Height

Lateral Surface Area = ( 3 + 15 + 3 + 15) x 3

Lateral Surface Area = 108 cm²

Find the total surface area:

Total surface area = 90 + 108 = 198 cm²

Find the cost:

1 cm² = $15

198 cm² = 15 x 198 = $2970

Answer: $2970