A driver just filled the car's gas tank with 27 liters of gasohol, a mixture consisting of 5% ethanol and 95% gasoline. If the car runs best on a mixture consisting of 10% ethanol and 90% gasoline, how many liters of ethanol must be added into the gas tank for the car to achieve optimum performance?	Choose the correct choice
A) 1.2	B) 1.5	C) 1.8	D) 2.1	E) 2.4
Let x be the number of liters of ethanol added to the gas tank.   0.05(27) + x = 0.1(27+x)   0.9x = 2.7 - 1.35= 
<gadget id="calculator">2.7 - 1.35</gadget>
<output>1.35</output>
1.35   x= 1.5 liters   The answer is 1.5.
<result>B</result>
A driver just filled the car's gas tank with 27 liters of gasohol, a mixture consisting of 5% ethanol and 95% gasoline. If the car runs best on a mixture consisting of 10% ethanol and 90% gasoline, how many liters of ethanol must be added into the gas tank for the car to achieve optimum performance?