A rectangular garden has a length of 18 m and a width of 12 m. The garden is required to be fenced with three rounds of wire. What is the total length of wire required to fence the garden?

The length of wire around the field in one round is equal to the perimeter of the garden.

Given, 

The length of the rectangular garden (l) = 18 m

The width of the rectangular garden (w) = 12 m

∴ The perimeter of the garden = 2(l+ w)                   [The garden is rectangular]

= 2(18 m +12 m)

= 2 × (30 m) = 60 m

⇒ The total length of wire required = 3 × 60 m = 180 m

Thus, the total length of wire required to fence the garden is 180 m.