How i solve the question of class 9th ncert math of Surface areas and Volumes chapter of exercise 13.5 of question no 4. I think it is very important question of class 9th give me the tricky way for solving this question
Find the cost of digging a cuboidal pit 8m long, 6m broad and 3m deep at the rate of Rs 30 per m3
The given pit has its length(l) as 8m, width (b)as 6m and depth (h)as 3 m.
Volume of cuboidal pit = l×b×h = (8×6×3) = 144 (using formula)
Required Volume is 144 m3
Now,
Cost of digging per m3 volume = Rs 30
Cost of digging 144 m3 volume = Rs (144×30) = Rs 4320