Maths Ratio change - Videos

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How to solve a ratio change question
Used algebra but can look at common multiples

Question from The Economist:
https://gmat.economist.com/gmat-practice-question/problem-solving/10dc2e/problem-solving-ratios-proportions-ratio-changes-by-additionsubtraction

resoureaholic useful notes too:
http://www.resourceaholic.com/2017/12/ratio.html

Video in response to viewer request- thank you!

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