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 

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