How to tell what gears are on a Peugeot bike?

I bought a used Peugeot. no indication of numbers. how do I know what the gears are?|||What do you mean by this? If you know how to count, do this: First, count the number of sprockets at the rear wheel. Next, count the number of chainrings on the front where the pedals are. Multiply the number at the back by the number at the front. this will give you the number of theoretical speeds you have. Next, you have to count the number of teeth each chainring and cog has. then you have to do some real work. You have to look at your wheel and tire size and calculate what gear you are in with every possible combination you get from the chainring/cog counts you have compiled.|||If you mean speeds than two in front and 5 in back is a ten speed. Or two in front six in back is a 12 speed.