formula for calling bets based on outs

[imported_bingobazza]

Hi guys,

Im a bit of a donk when it comes to maths problems, but Ive been trying to write a formula for the following, assuming we are on the flop

I have 'a' chance of hitting my outs on the turn (written as 0.2 rather than 20%, for example)
The pot size is 'P'
'n' is the number of callers i think Im going to get.

Im trying to solve the equation for the max bet I can make to give me the correct odds for my chance of hitting my outs, but Im a tiny bit out with this, and I cant correct for it.

Im sure this is a clumsy, and rudimentary post for many of you to read, but any help is appreciated.

Bingo