Sathi and Rathin invested some money in a business in the ratio 6 ∶ 5, but Sathi withdrew her money after a few months. If the end-of-twelve-months' profit was shared between Sathi and Rathin in the ratio 7 ∶ 10, for how many months did Rathin alone invest?

Sathi and Rathin invested some money in a business in the ratio 6 ∶

1.	Sathi and Rathin invested some money in a business in the ratio 6 ∶ 5, but Sathi withdrew her money after a few months. If the end-of-twelve-months' profit was shared between Sathi and Rathin in the ratio 7 ∶ 10, for how many months did Rathin alone invest?
A.	4
B.	5
C.	6
D.	7
Answer» C. 6