Question

a swimming pool is 20 m in length 15 in the breadth and 4 metre in depth find the cost of cementing its floor and wall rs12 per metre square​

Answer 1

Given that,

l=20m

b=15m

d=4m (d-h)

We know that,

Area for coner its floor2d(l+b)+lb

=2(4)(20+15)+(20×15)

=8×35+300

=280+300

=580m^2

Rate of coner its floor Rs.12/m^2

∴ Total cost of coner its floor =580×12

Rs.6960

Then,We get Rs.6960

Hope it will help you..