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How many liters of orange juice

one canned juice drink is 25% orange juice; another is 5% orange juice How many liters of each should be mixed together in order to get 20L that is 17%orange juice?
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1 Answer

L1X0.25 + L2X0.05 = 20*0.17
L1 + L2 = 20
-L1 - 0.2L2 = 4*20*0.17 = -13.6 first equation multiplied by -4
0.8 L2= 6.4
L2 = 8 lts
L1 = 12 lts
Check in the first equation.