Question

How much orange juice at 45 a liter should be mixed with grapefruit juice worth 35 a liter to make 200 liters of a mixture worth 40 a liter?

Answer 1

the amount of liters is 200,if the orange juice is x than grape juice. 200-x
45x+35(200-x)=200*40
45x+7000-35x=8000
10x=1000
x=100