How to understand the buy/sell rates when changing money?

Matt and Cyndi

New member
Ok...I understand how to convert currency. I know how to find out conversion rates. I just don't understand the signs. What are the buy/sell rates posted on the signs outside of exchange offices? For example, do they buy dollars and give me currency at the buy rate then sell me dollars back at the buy rate? Or is it backwards....they buy dollars at the buy rate then sell dollars back to me at the sell rate?
 
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