Which one of the five is least like the other four

Which number should come next in the series?
1 - 1 - 2 - 3 - 5 - 8 - 13
8
13
21
26
31

Which one of the five choices makes the best comparison?
PEACH is to HCAEP as 46251 is to:
25641
26451
12654
51462
15264

Mary, who is sixteen years old, is four times as old as her brother. How old will Mary be when she is twice as old as her brother?
20
24
25
26
28