One canned juice drink is 3030 % orange juice; another is 1010 % orange juice. how many liters of each should be mixed together in order to get 2020l that is 1919 % orange juice?

Let there be x litter of 3030 percent juice and (2020-x) litter of 1010 percent juice.

30.30x+10.10 (2020-x) = 19.19 (x+2020-x)

30.30x+10.10*2020-10.10x=19.19*2020

20.20x=19.19*2020-10.10*2020

20.20x=9.09*2020

x=909

2020-x=2020-909=1111

909 litters of 3030 percent juice and 1111 litters of 1010 percent juice should be mixed.