Verbal Reasoning - Arithmetic Reasoning - Discussion

For those who are asking why 4 is subtracted.

Answer:
27 poles on each side.
It means 4 poles were commonly shared by all sides.
By multiplying *4 we are considering those commonly shared poles also. So we are removing 4 poles.

It is like saying a car has 8 wheels instead of 4.
By considering the front and back sides also.
i.e.,
right side = 2 wheels.
Left side = 2 wheels.
Front side =2 wheels.
Backside = 2 wheels.

27 pole in each side means, the poles in the corner is common for two sides. Thus we subtracted the poles in the corner, i.e, 4 poles.

Why is 4 subtracted? Explain it?

For those asking why 104, here's a simple visualization. See how they share a common fence.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26 **
3 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 25 |
4 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24 |
5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 23 |
23 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5 |
24 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4 |
25 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3 |
26 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2 **
27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Remember, the fence we are talking about here is NOT the FLAT kind of fence.

Let's take 2 sides, let's say Top and Bottom. Both have 27 fence poles.

Then let's take Left and Right sides. They only have 25 fence poles remaining (still 27 per side but we won't count the other 2 because we already had them accounted in Top and Bottom sides).

That's (27*2)+(25*2) = 104.
or (25*4)+4 common corner = 104.

When its clearly written in question that he used 27 fence poles on each side, then it doesn't matters that each corner is common for 2 sides. He can still use 27 poles for each side, as stated in question.

Number of poles between two corners = 25.

So 25*4 = 100(4 sides).

100+4 = 104(4 corner poles).

I don't understand why 4 was subtracted at all. Please anyone explain it.

@Roop.

Why would it be 25 if it clearly states 27?

We have a square plot in each side there are 27 poles. So, 4 poles are common in each side :

(27 * 4)-4 =108-4 = 104 poles.
Therefore 104 poles are together used.

Why 4 is subtracted? Please explain it.