Half a number plus 5 is 13.What is the number?
Options:  A) 8  B) 16  C) 10  D) 11  E) 12

Rationale: "let x be the number . always replace ` ` is ' ' with an equal sign ( 1 / 2 ) x + 5 = 13 ( 1 / 2 ) x = 13 - 5 ( 1 / 2 ) x = 8 x = 16 correct answer is b"
Answer: B