How can you write nineteen in a manner that if we take out one, it becomes twenty?

Count the Triangle in the figure given below:

Find the missing number in the image below.

Move four matchsticks to the below square to form three squares?

What can you hold in your right hand, but never in your left hand?

Decode below rebus
D
N
A
T
S , D

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

What has 13 hearts but no other organs?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.