CBSE Notes, Lectures

CBSE - Mathematics - Surface Areas and Volumes

Surface Areas and Volumes

NCERT Exercise Exercise 13.5

Find the cost of digging a cuboidal pit 8 m long, 6 m broad and 3 m deep at the rate of Rs 30 per m3.

l = 8 m, b = 6 m and h = 3 m
Volume of the pit = lbh m3
 = (8×6×3) m3
 = 144 m3
Rate of digging = rs 30 per m3
Total cost of digging the pit =  rs(144 × 30) =  rs 4320

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