Question

Type 1 Area and Perimeter of Plane
Figures
1. A rectangular lawn 45 m by 30 m has two roads each
3 m wide running in the middle of it, one parallel to
length and the other parallel to breadth. The cost of
gravelling the roads at 90 paise per square metre is
(1) 3 194.40
(2) 210.20
(3) 245.40
(4) 162.20
(5) None of these
rectangular field walking​

Answer 1

Answer:

Answer

REF.Image

The cost of gravelling them at Rs. 1.20 per square meter = Rs . 1560

To find the area of roads :

It is given that

a rectangular lawn 80 m × 60 m has two roads each 10 m wide running in the middle of it.

Dimension of two roads are 80×10 and 60×10

Area of two roads = 80×10+60×10−10×10

=800+600−100

= 1300 sq. meter

To find the cost for gravelling

It is given that

The cost of gravelling the at Rs. 1.20 per sq. meter.

Therefore total cost = total area × cost per sq. meter

=1300×1.20

=Rs.1560

∴ The cost of gravelling them at Rs. 1.20 per sq. meter = Rs. 1560

solution