Cereal A is 10% sugar by weight, whereas healthier but less delicious Cereal B is 2% sugar by weight. To make a delicious and healthy mixture that is 6% sugar, what should be the ratio of Cereal A to Cereal B, by weight?
Choose the correct choice from the following answers:
A) 2 : 9	B) 2 : 7	C) 1 : 6	D) 1 : 1	E) 1 : 3

Rationale: "( 10 / 100 ) a + ( 2 / 100 ) b = ( 6 / 100 ) ( a + b ) 4 a = 4 b = > a / b = 1 / 1 answer is d ."
Answer: D