Solution:

It can be done as shown below.

Solution:

The triangle value is 1.

Solution:

9

Solution:

Greenhouse.

Solution:

Photocopier Machine

Solution:

The one on the right, as the diapers are near her.

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:

21, 28.

They are the numbers that either contain the digit 7 or are divisible by 7.

Solution:

5625

n^1
75 * 75 = 5625 (sum of first 75 odd numbers).
50 * 50 = 2500 (sum of first 50 odd numbers).