Question

A:B=5:6andB:C=4:7,findA:B:C.

Answer 1

multiply 5:6 by 4 and 4:7 by 6
a:b = 20:24
b:c = 24:42
now arrange values in form of a:b:c
20:24:42
now dividing
the answer will be
10:12:21
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Answer 2

A:B:C=5:10:7
Hope it is helpful