A hedge boundary needs to be planted around a rectangular lawn of size 72 m × 18 m. If 3 shrubs can be planted in a metre of hedge, how many shrubs will be planted in all?

Solution:

Given, a hedge boundary needs to be planted around a rectangular lawn of size 72 m × 18 m.

3 shrubs can be planted in a metre of hedge.

We have to find the number of shrubs that can be planted in all.

Perimeter of rectangle = 2(length × breadth)

Length of rectangular lawn = 72 m

Breadth of rectangular lawn = 18 m

Perimeter of rectangular lawn = 2(72 + 18)

= 2(90)

= 180 m

In one meter 3 shrubs can be planted.

Number of shrubs that can be planted in rectangular lawn = 3 × perimeter of lawn

= 3(180)

= 540 shrubs

Therefore, the number of shrubs that can be planted is 540.

✦ Try This: A hedge boundary needs to be planted around a rectangular lawn of size 80 m × 20 m. If 5 shrubs can be planted in a metre of hedge, how many shrubs will be planted in all?

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 11

NCERT Exemplar Class 7 Maths Chapter 9 Problem 73

A hedge boundary needs to be planted around a rectangular lawn of size 72 m × 18 m. If 3 shrubs can be planted in a metre of hedge, how many shrubs will be planted in all?

Summary:

A hedge boundary needs to be planted around a rectangular lawn of size 72 m × 18 m. If 3 shrubs can be planted in a metre of hedge, 540 shrubs will be planted in all.

☛ Related Questions:

• People of Khejadli village take good care of plants, trees and animals. They say that plants and ani . . . .
• The perimeter of a rectangle is 40 m. Its length is four metres less than five times its breadth. Fi . . . .
• A wall of a room is of dimensions 5 m × 4 m. It has a window of dimensions 1.5 m × 1m and a door of . . . .