SOLUTION: A 25% iodine solution is to be mixed with a 75% iodine solution to produce 5 gallons of a 70% iodine solution. How many gallons of each solution are needed? I wrote 2 equations,

Question 844671: A 25% iodine solution is to be mixed with a 75% iodine solution to produce 5 gallons of a 70% iodine solution. How many gallons of each solution are needed?
I wrote 2 equations, but got an unreasonable answer. Now I'm not really sure what to do. My equations were: x+y=5 and 0.25x + 0.75y= 0.70.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

x+y=5 0r x = (5-y)    and 

 

         y = 0.45*5gal / .5 = 4.5gal, amount of 75% solution    and then find (5-y) for the 25% solution

     

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