For any number Z, Z* is defined as the greatest positive even integer less than or equal to y. What is the value of 6.15 – 6.15*?	Choose the correct answer:
A) 1.5
B) 0.15
C) 6.25
D) 0.25
E) 6.0
Since Z* is defined as the greatest positive even integer less than or equal to Z, then 6.15* =6 (the greatest positive even integer less than or equal to 6.15 is 6).   Hence, 6.15 – 6.15* = 6.15 - 6= 
<gadget id="calculator">6.15 - 6</gadget>
<output>0.15</output>
0.15   Answer: 0.15.
<result>B</result>
For any number Z, Z* is defined as the greatest positive even integer less than or equal to y. What is the value of 6.15 – 6.15*?