Cereal A is 9% sugar by weight, whereas healthier but less delicious Cereal B is 2% sugar by weight. To make a delicious and healthy mixture that is 4% sugar, what should be the ratio of Cereal A to Cereal B, by weight?  Choose the correct choice from the following:	A) 2 : 9	B) 2 : 5	C) 1 : 6	D) 1 : 4	E) 1 : 3

Rationale: "( 9 / 100 ) a + ( 2 / 100 ) b = ( 4 / 100 ) ( a + b ) 5 a = 2 b = > a / b = 2 / 5 answer is b ."
Answer: B