Question 365490
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Hi, 
Let x represent the amount of pure iodine(that would be an 100% solution)
question states***
.15*24 + 1.00x = .25(24oz + x )
solve for x
.75x = .10*24oz
x = 3.2oz is the amount of oure iodine needed

checking our answer
.15*24 + 1.00x = .25(24oz + x )
3.6    + 3.2   = 6.8