The ratio between the present ages of P and Q is 6:7.If Q is 4 years old than P,what will be the ratio of the ages of P and Q after 4 years ?
Choose one:	A) 3:4	B) 3:5	C) 4:3	D) None of these	E) Cannot be determined
Solution   Let P's age and Q's age be 6x years and 7x years respectively.   Then,7x-6x = 4 ⇔ x = 4.   ∴ Required ratio = (6x + 4) : (7x + 4)=28 : 32 =7: 8. Answer None of these
<result>D</result>
The ratio between the present ages of P and Q is 6:7.If Q is 4 years old than P,what will be the ratio of the ages of P and Q after 4 years ?