Question

A rectangular field is $80m$ long and $60m$ wide. If fence posts are placed at the corners are $10m$ apart, along the 4 sides of the field, how many posts are needed to completely fence the field?

• A. $24$
• B. $27$
• C. $28$
• D. $29$

Answer 1

The correct option is C $28$

Let four posts be there at the corner $A,B,C,D$ of the rectangular field.
Then, along the length $AB$, we have $7$ posts and along the breadth $BC$, we have $5$ posts.
Total number of posts $=2(7+5)+4=28.$