The ratio of investments of two partners P and Q is 7:5 and the ratio of their profits is 7:9. If P invested the money for 5 months, find for how much time did Q invest the money? Choose the correct choice from the following.
A) 9	B) 17	C) 13	D) 10	E) 12

Rationale: "7 * 5 : 5 * x = 7 : 9 x = 9 answer : a"
Answer: A