Question

3. Four planks of wood, each of length 3 m and
breadth 2.1 m, are to be painted on both
sides. Determine the cost of painting at the
rate of 5.50 per sq. m.​

Answer 1

Answer:
The total cost of painting the four planks of wood each of length 3m and breadth 2.1 m at the rate of 5.50 per square meter is 277.2
Explanation:
We need to get the painted area of each plank.
Area of one side of the plank = Length × breadth
Doing the substitution we have:
Area = 3 × 2.1 = 6.3 m²
The plank is painted on both sides. So, The painted area is given by:
=2 × 6.3 m² = 12.6 m²
We have four planks, and so, the total area to be painted is:
4 × 12.6 = 50.4 m²
The cost of painting is:
Rs 5.50 per square meter
The total cost of painting = 5.50 × 50.4 = 277.2
The total cost of painting the four planks of wood each of length 3m and breadth 2.1 m at the rate of 5.50 per square meter is 277.2

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