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somia2105
An exchange rate of 1:9 between the European Euro and Mexican Pesos means that you can exchange 1 European Euro for 9 Mexican Pesos. 
Exchange rate of 1 European Euro is 9 Mexican Pesos and exchange rate of 1 Mexican Pesos is 1/9  European Euro. 
leahafarrow
it takes only one Euro to buy 9 pesos