In a rectangular ground 40 m long
and 30 m wide, lawn of width 2 m
is to be grown on all the four sides
inside the ground. Find the cost of
growing the lawn at the rate of 20
per square metre.
and 30 m wide, lawn of width 2 m
is to be grown on all the four sides
inside the ground. Find the cost of
growing the lawn at the rate of 20
per square metre.
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Answer:
the circumference of the area of the lot is 40 + 40 + 30 + 30 = 140 meters. Since the the path is 3 meters wide, it would appear that the area is 140 x 3 = 420 square meters. However, since this is an inside rectangle, we duplicate a 3 x 3 meter area at each of its 4 corners and we need to deduct 3 x3 x4 = 36 for a final answer of 384 sq. meters.
As an alternative resolution and cross-check we could also say that say that we pave each side of the lot with a 40 x 3 = 120 x 2 = 240 sq.meters. But we need to add the two short sides which are now only 24 meters long, namely the 30m lot width minus the two 3m strips on each side which are already paved. So we add 2 x 24 x 3 = 144 sq.m. and our final result is 240 + 144 = 384 sq. meters