4:105
7:15
20:21
2:35
3:20
Correct answer is B
p:q=13:12
pq=23
2q=3p...(1)
q:r=25:47
qr=25×74=710
10q=7r...(2)
Eliminating q, we have
(1) : 2q=3p
10q=15p
⟹15p=7r
∴
p : r = 7 : 15
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