Disinfecting solution

How much distilled water is necessary to pour into 500 ml of 33% hydrogen peroxide solution to obtain 3% disinfecting solution?

Correct result:

x =  5000 ml


33/100 • 500 = 3/100 (x+500)

33/100 • 500 = 3/100•(x+500)

3x = 15000

x = 5000

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