8 cups of water are to be poured into a 4-cup bottle and a 8-cup bottle. If each bottle is to be filled to the same fraction of its capacity, how many cups of water should be poured into the 8-cup bottle? Choose the correct choice from the following:  A) 2 / 3  B) 7 / 3  C) 5 / 2  D) 8 / 3  E) 16 / 3

Rationale: let x be the # of cups going into the 8 cup bottle . so . . . . x / 8 = ( ( 8 - x ) / 4 ) 64 - 8 x = 4 x 64 = 12 x x = 16 / 3 . answer : e
Answer: E