The marks obtained by Polly and Sandy are in the ratio 5:6 and those obtained by Sandy and Willy are in the ratio of 9:7. The marks obtained by Polly and Willy are in the ratio of...?
Answers:
A) 9:8	B) 11:10	C) 13:12	D) 15:14	E) 17:16
Polly : Sandy = 5:6 = 15:18   Sandy : Willy = 9:7 = 18:14   Polly : Sandy : Willy = 15:18:14   Polly : Willy = 15:14   The answer is 15:14.
<result>D</result>
The marks obtained by Polly and Sandy are in the ratio 5:6 and those obtained by Sandy and Willy are in the ratio of 9:7. The marks obtained by Polly and Willy are in the ratio of...?