8 l lemonade and1 l juice costs 12 euro. how much is the price per liter when the price per liter of juice is double of the price of lemonade

Let the cost of the lemonde per L   = C

Then, the cost of the juice per L   = 2C

And quantity * price per L   = total cost.....so we have

8C  + 1 (2C)  = 12

8C + 2C  = 12

10C  = 12      divide both sides by 10

C = 12/10 euros  = 1.2 euros.....this is the cost of each L  of lemonade

So.....the cost of each L  of juice is twice as much  =  2.4 euros

Check

8(1.2)  + 1(2.4)  =

9.6  + 2.4  =

12 euros