A:B=5:4 and A:C=6:5 then what is C:B=?
A/C = 6/5 —> C/A = 5/6 —> C = 5A/6
A/B = 5/4 —> B/A = 4/5 —> B = 4A/5
5A/6 5A 5
C/B = –––––– = –––– x ––––
4A/5 6 4A
the A's cancel C:B = 25:24
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