If x, y, and z are positive integers, and 2x = 5y = 6z, then the least possible value of x + y + z is  Choose one:
A) 15 B) 26 C) 37 D) 42 E) 60

Rationale: "take lcm of 2,5 and 6 = 30 now 2 x = 30 = > x = 15 5 y = 30 = > y = 6 6 z = 30 = > z = 5 15 + 6 + 5 = 26 . option b ."
Answer: B