Question

a pool is 20 m long,15 m broad and 4 m deep. find the cost is cementing its floor and it's walls at the rate of Rs.12 per square meter

Answer 1

length l = 20m , breadth b = 15m ,

depth h = 4m

area of the walls and the floor of the pool

= 2( l + b) × h + lb

= 2( 20 + 15) × 4 + 20 × 15

= 280m^2 + 300m^2

= 580m^2

cost of cementing 1 m^2 = ₹12

cost of cementing the walls and floor of the pool

= 580× 12 = ₹6960

Answer:

cost of cementing the walls and floor of the pool = ₹6960

Answer 2

area of 4 walls = 2(l+b) h
and area of floor = l×b
=[2(20+15)×4]+(20×15)
=[2(140)]+300
=280+300
=580m square
cost of cementing
= 580×12
=6960₹

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