Riddle #26 Answer
Answer: e n t
The first seven letters stand for - one two three four five six seven

Riddle #25 Answer
In a dictionary

Riddle #24 Answer
6:00am: since the clock is losing 24 minutes every hour, for every real hour that has passed, the clock will only show 36 minutes. Since the clock shows 3:00am, we know that 180 clock minutes have passed. This therefore equals 300 real minutes and hence 5 hours. The clock stopped 1 hour ago and the time must now be 6.00am.

Riddle #22 Answer
stop   
cheese  
foot  
top

Riddle #21 Answer
Answer
Each of the sentences in Group A contain two words that are anagrams of each other (space & capes, made & edam, file & life, slept & pelts). The fifth sentence in Group B has that characteristic (hornet & throne).

Riddle #20 Answer
the number "7" on the phone keypad

Riddle #19 Answer
Answer:
There are three possible solutions for this 51 and 15. 42 and 24. 60 and 06.