a is an integer greater than 9 but less than 21, b is an integer greater than 19 but less than 31, what is the range of a/b?	Choose the correct option
A) 1 / 4 B) 1 / 2 C) 2 / 3 D) 1 E) 5 / 4

Rationale: min value of a / b will be when b is highest and a is lowest - - - > a = 10 and b = 30 so , a / b = 1 / 3 max value of a / b will be when b is lowest and a is highest - - - > a = 20 and b = 20 so , a / b = 1 range is 1 - ( 1 / 3 ) = 2 / 3 . answer should be c
Answer: C