How many ml 30% of peroxide (H2O2) should be poured into 100ml H2O to give a 20% solution?

Correct result:

x =  200 ml


 0.30 x=0.20(x+100)  0.30 x=0.20 (x+100)  0.1x=20  x=200 ml \ \\ 0.30 \ x=0.20(x+100) \ \\ \ \\ 0.30 \cdot \ x=0.20 \cdot \ (x+100) \ \\ \ \\ 0.1x=20 \ \\ \ \\ x=200 \ \text{ml}

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