Question

3.) Which is more costly?
(a) Painting a square wall of side 15 m, at the rate of 5 per sq cm.
or
(b) Painting a wall 3 mx 5 m, at the rate of 5 per sq cm.​

Answer 1

Answer:

Step-by-step explanation:

(a)∴Side of the square is (s)⇒15 cm

∴Perimeter of a square is⇒4×s

⇒4×15

⇒60 cm²

∴Painting the square wall ⇒Perimeter× rate

                                            ⇒60×5

                                             ⇒₹300‬

(b)∴Since it is in the form of a rectangle so it will be

            Lenght⇒3m

           Breadth⇒5m

  So,perimeter of a rectangle is ⇒2(L+B)

                                                      ⇒2(3+5)cm

                                                        ⇒2×8 cm

                                                           ⇒16 cm

∴Painting a rectangular wall⇒Perimeter× rate

                                                ⇒16×5

                                                  ⇒₹80

So, Painting a square wall of side 15 m, at the rate of 5 per sq cm is more costly than   Painting a rectangular wall 3 mx 5 m, at the rate of 5 per sq cm.​

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