Question

please answer this question fast chapter name surface area and volume​

Answer 1

The cost of varnishing the whole box is Rs. 270.

Step-by-step explanation:

Given:

Length of box = 50cm

Breadth of box = 40 cm

Height of box = 30 cm

Rate of varnish = 5p/ cm²

To find the cost of varnishing the whole box, we calculate the surface area of the box

Surface area = 2*(length*breadth + length*height + breadth*height)

Substituting:

Surface area = 2*(50*40 + 50*30 + 40*30)

Surface area = 2*(2000 + 1500 + 1200)

Surface area = 2* (4700) = 5400 cm²

Total cost = Rate * Surface area

Total cost = 5 * 5400

Total cost = 27,000 p

1 p = $\frac{1}{100} Rs$

27000 p = $\frac{27000}{100}$

= Rs. 270

Answer 2

Given :

Length = 50 cm

Breadth = 40 cm

Height = 30 cm

Surface area of a cuboid = 2( lb + bh + hl)

= 2( 50 × 40 + 40 × 30 + 30 × 50 )

= 2( 2000 + 1200 + 1500 )

= 2( 4700 )

= 9400 cm²

Surface area to be varnished = 9400 cm²

Cost of varnishing 1 cm² = 5 p

= 0.05 rupee

Cost of varnishing 9400 cm² =9400×0.05

= 470 rupee

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