please help fast thxs

Question

A container is filled with 64L of orange juice, then 12L of juice are removed and the container is topped up with lemon juice. The juice is thoroughly mixed before 12L of the mixture is removed and the container is again topped up with lemon juice. how many Litres of lemon juice is in the final mixture? 

Answer 1

64L-12L = 52L mixed with 12L of lemon juice

throughly mixed, then another 12L is removed (taking out 12x12/64 =2.25L lemon juice), leaving 52L of the mixture (which is 9.75L lemon juice) mixed with another 12L lemon juice, for a total 21.75L lemon juice

total Lemon juice in the final mixutre is 21.75L

You added 12L of Lemon juice twice, so you know maximum possible Lemon juice in the final mixture is 2 x 12 = 24L. But it's a little less since you removed 12L of the first mixture which was 12 times 12/64 = 2.25 Liters Lemon judge. 24-2.25 = 21.75L