What must be added to each term of the ratio 4 : 15, so that it may become equal to 3 : 4? Pick:	A) 18	B) 29	C) 39	D) 49	E) 59

Rationale: "let x be added to each term of the ratio 4 : 15 . new ratio becomes ( 4 + x ) / ( 15 + x ) , which is given to be equal to 3 : 4 . this means , ( 4 + x ) / ( 15 + x ) = 3 / 4 solving we get , x = 29 . ans b"
Answer: B