if a : b equal to 2 : 3 b : c is equal to 4 : 5 then c : a is ?
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a:b=(2:3)×4:4
b:c=(4:5)×3:3
a:b=8:12
b:c=12:20
a:c=8:20
a:c=2:5
c:a=5:2
b:c=(4:5)×3:3
a:b=8:12
b:c=12:20
a:c=8:20
a:c=2:5
c:a=5:2
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