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Continue to ChatGMAT PS : Percents, Ratio https://gmat-prep-blog.wizako.com/gmat-quant-practice/word-problems/gmat-ps-percents-ratio/
GMAT PS : Percents, Ratio https://gmat-prep-blog.wizako.com/gmat-quant-practice/word-problems/gmat-ps-percents-ratio/