SOLUTION: how many cups of an 18% salt solution must be added to 16 cups of a 25% solution to get a 20% solution

Question 413142: how many cups of an 18% salt solution must be added to 16 cups of a 25% solution to get a 20% solution
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

Let x represent the number of cups of the 18$ solution

Question states*** "Mixing"

 .18x + .25*16 = .20(16+x)

Solving for x

  18x + 25*16 = 20(16+x)   |multiplying thru by 100

        5*16 =  2x

        40 = x            

CHECKING our Answer***

 .18*40 + .25*16 = 7.2 + 4 = 11.2 = .20*56 

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