Problema Solution
If 800 ml of juice is15% grape juice.how much grape juice should be added to make a drink that is 20% grape juice?
Answer provided by our tutors
800 ml of 15% grape juice
y/800 = 0.15
y = 120 ml of pure grape juice was used
800 - 120 = 680
so 120 ml of grape juice was mixed with 680 ml of base used to make the 800 ml of 15% juice
We want a 20% mixture by adding 'x' ml of pure grape juice to this 800 ml batch
(120+x)/(800+x)=0.20
(120+x) = 160 + 0.20x
40 = x - .20 x = 0.80 x
x = 40 / 0.80 = 50
so adding 50 ml of pure grape juice is requred