Question 413142
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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