If x, y, and z are positive integers and x = 4y = 7z, then the least possible value of x - y - z is
Choices
A) 33 B) 17 C) 49 D) 16 E) 23
x - y - z = x - x/4 - x/7   = (28 - 7 - 4 )x/28 = 17x/28   17 is not divisible by 28(it's a prime #), so for least value, x = 28   Answer - 17
<result>B</result>
If x, y, and z are positive integers and x = 4y = 7z, then the least possible value of x - y - z is