Linda has 10 liters of a juice mixture that is 40% juice. Which equation can be used to find how many...

Linda has 10 liters of a juice mixture that is 40% juice. Which equation can be used to find how many liters of pure juice, x, should be added to make a mixture that is 60% juice?
4/(10 + x) = 0.6
10/(4 + x) = 0.6
(4 + x)/(10 + x) = 0.6
(10 + x)/(4 + x) = 0.6
How many liters of pure juice should be added to make a mixture that is 60% juice?
_____ liters