The ratio of investments of two partners P and Q is 7:5 and the ratio of their profits is 7:10. If P invested the money for 2 months, find for how much time did Q invest the money?	Answers
A) 8
B) 10
C) 18
D) 4
E) 12

Rationale: "7 * 5 : 2 * x = 7 : 10 x = 4 answer : 4 answer is d"
Answer: D