Question

Class 9th maths ch 13 ex 13.5

Answer 1

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Answer 2

Step-by-step explanation:

Given

Length = 8m

Breadth = 6m

Height = 3m

Cost = Rs. 30 per m^3

To find

Cost of digging a cuboidal pit.

Solution

Volume of a cuboid = base area × height = length × breadth × height = lbh.

So here, we have to find the volume of a cuboidal pit.

So, base area = 8m long & 6m broad

= 8×6 = 48m

so, 8m × 6m × 3m = 144m^3

Now,

we have to find out the cost of the cuboidal pit.

So here, cost = Rs. 30 per m^3 ( given )

144 m^3 × 30m^3

= 4320 m^3

Therefore, the cost of digging a cuboidal pit is = Rs. 4320 m^3 .

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