If 1 part bleach and 4 parts water = 5 parts, then what do you need to do to get 10 parts? Although this does not solve the problem for you, I hope it leads you to the solution.
Thanks for asking.
Lol hmmm well the ratio is 1:4 which is 5 parts. To get 10 u just multiply the ratio by two. Or since the ratio is 1:4 u know that bleach is 20 % of ur solution
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