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?

Created: 2 years ago | Updated: 10 months ago

Updated: 10 months ago

20/19

10/9

9/10

Des

317

Best Ans:

orginally fuel contained 20 * 5% = 1 gallon of entanol

after adding X amount of enthanol

total weight of the fuel = 20+x

amount of ethanol will be = 1+x

A.T.Q ….(1+x) is 10% of (20+x)

(1+x/20+ x)*100 = 10

100+100x=200+10x

90x=100

x= 10/9

10 months ago

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