Question

8. Find the cost of cementing the crossroads in figure (b) and figure (c) part of question 7, if the cost
per cm2 is 7.80.​

Answer 1

Answer:

Question 5: A path of 1m width is built along the border and inside a square garden of side 30m. Find:

(i) the area of the path

(ii) the cost of planting grass in the remaining portion of the garden at the rate of Rs 40 per m2.

rectangle

Solution: Given, side of the garden = 30m, Width of the path inside the garden = 1m, Cost of the planting of grass = Rs 40 per m2.

Therefore, side of the garden without path = 30m — 1m — 1m = 28m

Area of square = Side2

Area of square garden

=

30

2

=

900

m2

Area of garden without path

=

28

2

=

784

m2

Area of path = Area of garden — Area of garden without path = 900m2 —784m2 = 116 m2

Cost of planting grass in the remaining portion of garden = Rate × Area

=

R

s

.

40

×

784

=

R

s

.

31360