the age of mother one decade age was 3 times the age of her daughter . 10 years hence , mother ’ s age will be two times that of her daughter . the proposition of their current ages is :  Pick:	A) 7 : 3	B) 6 : 3	C) 8 : 3	D) 2 : 3	E) 6 : 3

Rationale: a 7 : 3 let , ages of mother and daughter 1 decade ago was 3 a and a years correspondingly then , ( 3 a + 10 ) + 10 = 2 [ ( a + 10 ) + 10 ] 3 a + 20 = 2 a + 40 x = 20 needed ratio = ( 3 a + 10 ) : ( a + 10 ) = 70 : 30 = 7 : 3
Answer: A