alleryIf a : b = 3 : 4 and b : c = 5 : 7, then a : c is
A3 : 7
B15 : 28
C12 : 35
D21 : 20
Answer & Solution
Correct answer: B. 15 : 28
**Common b:** a : b = 15 : 20 (multiply by 5)
b : c = 20 : 28 (multiply by 4).
**So a :** c = 15 : 28.
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