Todays puzzle 11-11-2011

its $11.25 which i have to carrry when i enter in casino.

I have to carry $11.25 /- when i enter into the casino 

the problem is splved in this way 

[{(x-5)X2}-10] X 2 -5  =0

[{(x-5)X2}-10] = 2.5

{(x-5)X2} = 12.5

(x-5) = 6.25

x = 6.25 + 5

x = 11.25

shortand simple...

he has to pay

entry to gate 1=5 ....double... exit =5

entry to gate 2=5 ....double... exit =5

entry to gate 3=5 ....double... exit =5

entry to gate 4=5 ....double... exit =5

the ans is 14.0625...attached is the excel file ..

7.5$

enter A - 5$

doubles 2.5 $ = 5$

come out of B

Enters C pays 5$

balance Nil

doubles "0"

comeout of D Nil money

Correct ans is $11.25. 

Gate A pays $5 and left with $6.25. Inside doubles and get $12.5. Then exits at Gate B pays $5 and left with $7.5. Then enter from Gate C and pays $5 and left with $2.5. Inside double and get $5 and while finally exits at Gate D pays $5 and left with no money.

Correct answer is 11.5$ for sure,............

sorry my ans is wrong..i counted the gates...wronly