Narcisse and Aristide have numbers of arcade tokens in the ratio \(7 : 3,\) respectively. Narcisse gives Aristide some

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Narcisse and Aristide have numbers of arcade tokens in the ratio \(7 : 3,\) respectively. Narcisse gives Aristide some of his tokens, and the new ratio is \(6 : 5.\) What is the least number of tokens that Narcisse could have given to Aristide?

a. 9
b. 17
c. 21
d. 27
e. 53

Answer: B

Source: Manhattan GMAT
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