Solution:

120 times

Solution:

Hhe hung herself using big Ice slabs , which are now now melted and hence puddle of water.

Solution:

The Password.

Explanation:
Clues 2 and 5 are correct and rest are lies.

Solution:

When you were inside the shed, the murderer replaced the lock with his own one that was identical to your original lock. When you locked the store room, you did not require a key and there was nothing abnormal for you. When you left, the murderer opened the lock with his key, planted the dead body inside and replaced the lock again putting the original lock in the place. He then closed it without any problem.

Solution:

2 people

Say 2 helpers are Helper1 & Helper2

Helper1 food Helper2 food McDuck's Food
End of Day 1 : 1 4 4
Now 'A' will head back

End of Day 2 : N/A 2 4
Now 'B' will head back

Now Mr. McDuck have 4 day food :-)

Solution:

They use the bricks and dirt from the tunnel to stand on it.

Solution:

8/(1−1/5)

Solution:

He askes the god to beat him half to death.

Solution:

C7 => B8
Exchange pawn for a knight

Check-Mate

GameOver

Solution:

7 Races.

Solution:

Kid1, he was left with one rock.