A Quick Challenge on Preflop Equity; No Cheating!

[James.]

"bob" limps in ep with 7 [img]/images/graemlins/diamond.gif[/img]7 [img]/images/graemlins/heart.gif[/img], "al" raises with A [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/spade.gif[/img] in MP, we're on the button with J [img]/images/graemlins/heart.gif[/img]T [img]/images/graemlins/heart.gif[/img] and we know the BB "ace" will call any number of bets with any two cards.

what is our best play? what is everyone's preflop equity in the hand? you have to make a guess without using any simulating software. write it down, etc. and next, check your answer:

bob with his 77: w%
al with his AKs: x%
ace with his junk:y%
us with JTs: z%

how'd you do? linky link to the answer