Solution:

Short

(shorter - er = short)

Solution:

2(remember bodmas)

Solution:

Name

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:

0! or cos(0)

Solution:

28 =>1+2+4+7+14

cannot be 1 (as number cannot be included)

Solution:

There are 3 fruits (1 grapes, 1 apples, and 1 oranges).

Solution:

Old password : altered

New Password : distinct

Solution:

Noon

Solution:

245 minutes

It will take 49 cuts not 50.
so 49*5 => 245 minutes