Dilute 8392

I have 500ml of 31% acid and must dilute it to 5%.
How many ml of water do I need to add?

Correct answer:

x =  2600 ml

Step-by-step explanation:


500·0.31 = (500+x) · 0.05

0.05x = 130


x = 130/0.05 = 2600

x = 2600

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