Question

a swimming pool is 20 metre in length 15 m in breath ,4m in depth. find the cost of cementing it's floor and walls at rupees 35 per metre square

Answer 1

dimensions of the swimming pool ,( cuboid )

length = l = 20m

breadth= b = 15m

depth = h = 4 m

Area of cementing floor and walls

= area of the floor + area of the four walls

= lb + 4( l + b ) h

= 20 × 15 + 4 [ 20 + 15 ] × 4

= 300 + 560

= 860 square meters.

according to the problem given,

cost of cementing 1 square meter = Rs 35

cost of cementing 860 square meters = ?

cost = 860 × 35

= Rs 30100

Answer 2

L=20m
b=15m
depth=4m
L.S.A of cuboid=2h(l+b)
=2×4(20+15)
=8(35)=280sq.m
area of floor=l×b=20×15=300 sq.m
total area=280+300=580sq.m
cost of cementing=Rs.35 per sq.m
total cost =580×35=20300