Question

A room is 6 m long 4.5 m wide and 3 m high. Find the cost of cementing inner portion of the wall at the rate of rs 5.50 permeter square.

Answer 1

Hey guys,

Answer:-

Given,

L=6m

B=4.5m

H=3m

We know that,

Area of painting four

walls=surface area of cuboid

So,

S.a of cuboid = 2h(l+b)

=2×3(6+4.5)

=6(10.5)

=63msq

Now,

Rate of painting four walls=5.5rs /sqm

=63×5.5

=346.5rs

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Answer 2

Answer:

643.50 Rs

Step-by-step explanation:

The room is in cuboidal shape

∴Total surface area of cuboid shape room = 2 (lb + bh + hl)

                                                                       = 2 (6×4.5 + 4.5×3 + 3×6)

                                                                       = 2 (27 + 13.5 + 18)

                                                                       = 2 × 58.5 = 117 m²

Rate of cementing is Rs. 5.50 per m²

∴ cost of cementing the area 117 m² = 117×5.50 = 643.50 Rs