Question

find the cost of fencing a garden only only on 3 sides of lengths 20cm,16cm and 5cm at the rate of Rs54per m.

Answer 1

find the perimeter first .hence only three sides are mentioned so it is a triangle
perimeter of triangle=sum of all sides
= 20 +16 +5
=41cm
1cm= 1/100m
41cm=41/100m
=0.41m
the rate of fencing 1m=₹54/m
the rate of fencing 0.41m= 54*0.41
=₹22.14

Answer 2

See the attached file