Find the fraction which has the same ratio to 1/2 that 2/5 has to 3/7  Options: A) 1 / 2 B) 2 / 12 C) 14 / 30 D) 3 / 8 E) 7 / 9

Rationale: "a : 1 / 2 = 2 / 5 : 3 / 7 as the product of the means is equal to the product of the extremes . a * 3 / 7 = 1 / 2 * 2 / 5 a * 3 / 7 = 2 / 10 a = 14 / 30 = > a = 14 / 30 answer : c"
Answer: C