Ratio Problems (Solving by Two Methods)

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Tk you for your video, very nice you enthusiasm is contagious but I have to be honest, I dont have a clue how you got the answers. In other words, I DID NOT UNDERSTAND the process, the steps that you use to obtain the answers!!

sandraekhoff
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Sir, what is componendo and dividendo?

ashking
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Which school do You teach at in Sydney?

yasirzafar