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 5 months, find for how much time did Q invest the money?	Choose the correct option.
A) 19	B) 17	C) 13	D) 10	E) 12
7*5: 5*x = 7:10   x = 10   Answer: 10
<result>D</result>
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 5 months, find for how much time did Q invest the money?