The ratio of investments of two partners P and Q is 7:5 and the ratio of their profits is 7:12. If P invested the money for 5 months, find for how much time did Q invest the money? Choose the correct choice:
A) 19
B) 17
C) 13
D) 10
E) 12

Rationale: "7 * 5 : 5 * x = 7 : 12 x = 12 answer : e"
Answer: E