For any number Z, Z* is defined as the greatest positive even integer less than or equal to y. What is the value of 6.45 – 6.45*? Answers
A) 0.45	B) 0.5	C) 6.45	D) 0.25	E) 6.0

Rationale: "since z * is defined as the greatest positive even integer less than or equal to z , then 6.45 * = 6 ( the greatest positive even integer less than or equal to 6.45 is 6 ) . hence , 6.45 – 6.45 * = 6.45 - 6 = 0.45 answer : a ."
Answer: A