Of three positive numbers, the ratio of first and second is 5 : 6 and – McqOptions

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1.	Of three positive numbers, the ratio of first and second is 5 : 6 and that of second and third is 9 : 1. The product of first and third number is 480. What is the sum of the three numbers?
A.	140
B.	640
C.	720
D.	840
Answer» B. 640

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