Solution:

The baby

Solution:

There are no easy ways to double your money unless you put it in front of a mirror.

Solution:

Baby girl because she is a little bigger.

Solution:

A bubble.

A bubble is lighter than air, but no matter how many people try, they cannot lift or hold a bubble in their hands because it will burst upon contact.

Solution:

Velma waits until night time and then goes through the second door.

(No sun at night)

Solution:

A lion, king of the jungle! (the head of a Lamb, the middle of a pIg, the hind of a buffalO and the tail of a dragoN)

Solution:

1st person : Colin
2nd person : Rooney

They both lied.(I said at-least)
(If only one lied they would both be boys or both be girls)

Solution:

Twinkle and Rinki start on opposite sides of the river

Solution:

Bookkeeper (00 kk ee)

Solution:

Each word rhymes with its numeric position in the list. (e.g. 'gun' rhymes with 'one'
etc.)