If x and y are integers, what is the least positive number of 24x+18y?	Select:  A) 3  B) 6  C) 9  D) 12  E) 15
24x+21y = 6(4x+3y) which will be a minimum positive number when 4x+3y = 1.   4(1) + 3(-1) = 1   Then 6(4x+3y) can have a minimum positive value of 6.   The answer is 6.
<result>B</result>
If x and y are integers, what is the least positive number of 24x+18y?