Question 698517
 How much pure juice must be added to a 1 liter of juice that is 5% juice in order to obtain a drink that is 25% juice? 
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let x=amt of pure juice to be added
5%*1+100%x=25%(x+1)
.05+x=.25x+.25
.75x=.20
x=.20/.75≈0.27
amt of pure juice to be added≈0.27 liters