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ratios are just like fraction so lets say 4:5 it would be 4/5 so if you need to add divide multiply or subtract ratios you are actually doing that to a fraction hope this helps ;)
you look at what they give you. it says TI/NA TI is 90 and NA is 55 so 90:55. IM/AP IM is 70 and AP is 41 70:41. MT/PN MT is 83 and PN is 50 83:50

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