CuSO4 mixture

How many grams of solid CuSO4 we have to add to 450g of 15% CuSO4 solution to produce a 25% solution?

Result

x =  60 g

Solution:

 x+0.15 450=0.25 (x+450)  0.75x=45  x=60 =60 g \ \\ x + 0.15 \cdot \ 450=0.25 \cdot \ (x + 450) \ \\ \ \\ 0.75x=45 \ \\ \ \\ x=60 \ \\ =60 \ \text{g}



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