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Bob just filled his car's gas tank with 20 galions of gasohol , a mixture consisting of 5% ethanol and 95% gasoline. If his car runs best on a mixture consisting of 10% ethanol and 90% gasoline, how many gallons of ethanol must he add into the gas tank for his car to achieve optimum performance?

A. 20/19
B. 10/9
C. 9/10
D. 1
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সঠিক উত্তরঃ C. 9/10
Explanation: