Peroxide

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

Correct result:

x =  200 ml

Solution:

 0.30 x=0.20(x+100)  0.30 x=0.20 (x+100)  0.1x=20  x=200=200 ml



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