What is the value of 1/(X 2/3)? 07/22/2017 – by Mod_GuideK 0 If 1/X = 2.5, then what is the value of 1/(X 2/3)? A. 2.25. B. 3.5. C. 3.75. D. 1.75. E. 3.75. SHOW ANSWERSCorrect Answer: C Explanation/Reference: Explanation: If 1/X is 2.5 or 5/2 then X = 2/5. 1/(2/5 2/3) is 1/(6/15 10/15) = -15/4 = -3.75. Download Printable PDF. VALID exam to help you PASS.