Question

A lawn is 75 m long and 60 m wide. There is a swimming pool of length 20 m and breadth 7 m in this lawn. Find the cost of putting grass in the remaining part of the field at rupee 45 per square metre.​

Answer 1

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Breadth of lawn :- 60m (B)

Length of lawn :- 75m (L)

Breadth of swimming pool :- 6m (b)

Length of swimming pool:- 20m ( l )

Therefore, the area ofor remaining part of the field ;

Area of the lawn - Area of swimming pool

= (L×B) - ( l×b)

= (75×80) - (20×7)

= 6000 - 140

= 5860 metre square .

Cost for planting grass / m square :- 30 rupees

= 5860 ×45

= 263700 rupees .

Answer 2

Given:
Length of lawn = 75m
Width of lawn = 60m

Length of swimming pool = 20m
Width of swimming pool = 7m

Now,
Area of lawn = L x B
=> 75 x 60 m^2
=> 4500 m^2

Area of swimmers pool = L x B
=> 20 x 7 m^2
=> 140 m^2

Now,
Area of lawn - Area of swimming pool
=> ( 4500 - 140 ) m^2
=> 4360 m^2

Cost of cutting grass in the field =
4360 x 45
= ₹ 1,96,200

Hopw this helps :)