student bar on a thursday night (still sober a this point in time) charge £1 for one pint of beer. There are 8 pints to the gallon so £7.50 means nearly a gallon
Don't let my age put you off, I can work in ye old ways just as well as SI.
since someone wanted a quote in litres I shall do as I've been asked. 1 pint is equal to 567ml (near enough for the purposes of beer as pubs give you a bit more to make sure they don't give you too little)
7.5 times 0.567 equals 4.2525
A tip for parties
if the beers are kept in a bucket of chilled water take the cans at the bottom. IIRC the tipical machine used to fill the beer cans has a standard deveation of 0.35 so the ones at the very top floating light wont have as much as you want, the cans at the bottom make up thev other end of the statistics