Question

the length breath and height of room are 5m, 4m, 3mm respectively. find the cost of white washing the walls of room and ceiling at rate of ₹7.50 per m√2​

Answer 1

Given :

⬤ Length of the Room is 5 m .

⬤ Breadth of the Room is 4m

⬤ Height of the Room is 3 m .

To Find :

⬤ Cost of White Washing the Wall of Room and Ceiling at the Rate of ₹ 7.50 per m² .

Formula Used :

$\bf[\:{Surface\:Area\:of\: Cuboid=2(lb+bh+hl)-lb}\:]$

• l = Length
• b = Breadth
• h = Height

Solution :

• Length = 5 m .
• Breadth = 4 m .
• Height = 3 m .

According to the Formula :-

2 (lb + bh + hl)

2 (5×4 + 4×3 + 3×5) - (5×4)

2 (20 + 12 + 15) - 20

2 (46) - 20

94 - 20

74

Therefore , The Surface Area of Cuboid is 74 m² .

Now :

Cost of Ceiling at ₹ 7.50 per m² = 74 × 7.50

= 555

Therefore , The Cost of Ceiling at ₹ 7.50 per m² is 555.00 m² .

Answer 2

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According to the Formula :-

• 2 (lb + bh + hl)
• 2 (5×4 + 4×3 + 3×5) - (5×4)
• 2 (20 + 12 + 15) - 20
• 2 (46) - 20
• 94 - 20
• 74

Therefore , The Surface Area of Cuboid is 74 m² .

Now :

Cost of Ceiling at ₹ 7.50 per m² = 74 × 7.50 = 555

Therefore , The Cost of Ceiling at ₹ 7.50 per m² is 555.00 m².