The ratio of investments of two partners A and B is 7:5 and the ratio of their profits is 7:10. If A invested the money for 5 months, find for how much time did B invest the money ? Choose the correct option:
A) 11 months	B) 9 months	C) 7 months	D) 10 months	E) NONE OF THESE
Explanation:   7x5: 5xk = 7:10   k = 10 months   ANSWER IS 10 months
<result>D</result>
The ratio of investments of two partners A and B is 7:5 and the ratio of their profits is 7:10. If A invested the money for 5 months, find for how much time did B invest the money ?