Question

Q30. Find the cost of fencing a square park of side 250 m at the rate of ₹ 20 per

meter ?

Q31. Pushpa pays ₹ 7500 as rent for 3 months. How much does she has to pay for

a whole year, if the rent per month remains same ?

Q32. A rectangular piece of land measures 0.7 km by 0.5 km. Each side is to be

fenced with four rows of wires . What is the length of the wire needed ?​

Answer 1

Step-by-step explanation:

30)

Side of square = 250 m

Perimeter of square = 4 x side

= 4 x 250 = 1000 m

Since, cost of fencing of per meter = Rs. 20

Therefore, cost of fencing of 1000 meters = 20 x 1000 = Rs. 20,000

31)

Rent for 3 month= ₹7500

rent of 1 month = ₹ 7500/3

rent of 1 month = rent of 12 month

₹= 7500/3× 12

= 7500× 4

= ₹ 30,000

32)The perimeter of a rectangular piece of land = 2(Length + Breadth)

= 2(0.7+0.5)

= 2(1.2)

= 2.4 km

\because1km\ =\ 1000m∵1km = 1000m

\therefore0.24\ =\ 1000\times0.24=2400∴0.24 = 1000×0.24=2400 m.

Since 4 rows of wire is required.

\therefore2400\times4=9600∴2400×4=9600 m.

\therefore9600\ m\ =\ 9.6\ km∴9600 m = 9.6 km

Therefore, length of wire required is 9.6 km or 9600 m.