A rectangular

A rectangular garden 40 m long and 30 m wide is to be fenced with fence posts at each corner. All the other posts will be 5 meters a part. How many posts will be needed to fence in the garden.

Correct result:

n =  28


a=40 m b=30 m d=5 m  o=2 (a+b)=2 (40+30)=140 m  n=o/d=140/5=28

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