im in a bit of a pickle

i can work most bets out but seem to struggle with round robins.
eg. 50p round robin is a fiver = 10 bets.
1 x accumulator
3 x singles
3 x doubles
are the other 3 bets 'cross bets' ??
if so , how do you work it out.
do me a favour and work this out. i cant collect my bet till monday because i left the slip at work. i want to kno how much im gunna get.
25p e/w round robin. ( 5 quid )
1st @ 4/1
1st @ 5/1
1st @ 6/1
thanx............