A rectangular lawn of 24 x 36 m2 has two
roads each 4m wide running between the
park. One is parallel to length and other is
parallel to width. Cost of gravelling is 25
paise/m2. Find the total cost of
gravelling?
I
Rs. 84
Rs. 64
ח
Answers
Given:
The length of the rectangular lawn is 36m
And the breadth of the rectangular lawn is 24m
Also,
Given that two roads each 4m wide running between the park. One is parallel to the length and the other is parallel to the width.
So, see the attached image.
ABCD is a rectangular lawn.
GHKL and EFIL are the two roads running between the park, parallel to width, and length respectively.
So,
In GHKL
Length = 24m and breadth = 4m
Area = lb = 24 × 4 = 96m²
And,
In EFIL
Length = 36m and breadth = 4m
Area = lb = 36 × 4 = 144m²
There is square MNOP
Area = side² = 4² = 16m²
So,
Now adding both and subtracting the area of the square
= 96 + 144 - 16
= 240 - 16
= 224 m²
So, we get the are of the two roads
Now,
Cost of graveling per m² = 25 paise
So,
For 224m²
= 224 × 25
= 5600 paise
So,
5600 ÷ 100 = Rs.56
Hence
The cost will be Rs. 56
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☞ Given,ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ
A rectangular lawn 60 meters by 40 meters has two roads each 5 meters wide running in the middle of it one parallel to length and the other parallel to breadth
Area of the road=40×5+60×5−5×5
=200+300−25
=475sqmㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ
☞ Cost of graveling the roads =60 paise per sq meter.
∴475×60paiseㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ