RE: Puzzle Contest #7 - First to get all the correct answers wins 5 SBD, all attempts will receive an upvote.

[arcrypto]

#Attempt1

Answer 1 : 9
Answer 2a, 2b, 2c : 6, 3, 4 respectively
Answer 3 : 3
Answer 4a , 4b : 60, 65 respectively