31 and 15
31+15=46
31-15=16
x-4>15.5
x>15.5+4
x>19.5
i suppose the answer is D since it is the closest to ^.
3 ways
1st way: Anthony- Gold William-Red Christopher-Green Mathew-Blue
2nd way: Anthony- Blue William-Gold Christopher-Red Mathew-Green
3rd way: Anthony-Green William-Blue Christopher-Gold Mathew-Red