20 divided by 10 is 2 so for every 2 miles it travels it uses 1 gallon of gasoline. 20 + 14 is 34 so you divide 14 by 2 to get 7. then you add 10+7 to get 17. it will take 17 gallons of gasoline to go 34 miles
<span>10x + 30(2) = 20(x + 2) 10x + 60 = 20x + 40 10x = 20 answer x = 2 liters So you would need 2 liters of the 10% solution to make the 30% solution 20%.</span>
