Question

a swimming pool is 49 meter × 30 metres
× 4 metres find the cost of cementing its floor and walls at rupees 1.50 per square metres​

Answer 1

Answer:

area of a rectangle= 2(lb+bh+hl)

l=49m

b =30m

h=4m

2(49×30+30×4+4×49)

2(1470+120+196)

2(1786)

=3572m square

now the cost for per square m = 1.50rupees

.: cost of 3572m square

= 3572×1.50

= 5358 rupees

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Answer 2

here l=49m b=30m h=4m

Total surface area = 2(lb+bh+lh)

Area of swimming pool =2(lb+bh+lh)-lb

=2(49×30+30×4+4×49)-49×30

=2(1470+120+196)-1470

=2×1786-1470

=3572-1470

=2102 m²

Now

cost of cementing 1m² =₹1.50

therefore coast of cementing 2102m²=> 2120×1.5 = ₹3180