a bike with 27" wheels is likely to have a 52/42 or 52/40 crank. Freewheels, which is what you're likely to find on such a bike, came in huge range of ratio spread, ranging from the ever-unuseful 13-18 to things having a big cog of 34 teeth (usually with an 8 or 10 tooth jump down from that.)
If I lived somewhere where there were hills, I'd want lower gearing. I'd want lower gearing, even in flatlandia, were I pulling a trailer. If you get an Asian made bike, it will have standard threading, which makes putting a triple, or a double with a more sensible range, easy. (if not cheap, if you want something shiny, or vintage. Options range from a 20 buck bottom bracket and a 30 buck mountain crankset in black to that same bottom bracket and a 120 buck sugino triple in super shiny, to arm-and-leg vintage stuff. Plus maybe a derailleur and shifters, depending.) If you get something French, it's harder.