If x and y are integers, what is the least positive number of 24x+20y? Answers.
A) 2 B) 3 C) 4 D) 6 E) 8

Rationale: 24 x + 20 y = 4 ( 6 x + 5 y ) which will be a minimum positive number when 6 x + 5 y = 1 . 6 ( 1 ) + 5 ( - 1 ) = 1 then 4 ( 6 x + 5 y ) can have a minimum positive value of 4 . the answer is c .
Answer: C