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Thank you. Considering what you have said about your 48/19 I am not gonna go for 22T but 20T and try it out. the area is not that hilly there are just 4-5 regular hills i ride. i am not strong.
Looked at this calculator http://www.bikecalc.com/cadence_at_speed
With 47Tx20T, I will only have to do 53 rotations per minute to achieve the 10-15 mph.
Whereas with 47Tx22T, I will have to do 58 rotations per minute to achieve the 10-15 mph.
wqvm
Remember that removing 1 tooth from the chainring doesn't have the same effect as adding 1 tooth to the cog/freewheel; it's about the ratio between the two.
So for example 48/16 is equal to 42/14 (divide both sets of numbers and you get the equal number of 3). How many teeth you need to add to your cog/freewheel to achieve the gear ratio best suited for you is for a large part trial and error and dependent on how hilly your area is and how strong you are.
Going from 47/18 to 47/22t is a huge difference though. I ride 48/19 on my city bike (which is slightly easier than your 47/18) and I find it quite spinny. But your miles may vary!