Can you solve this picture maths equation?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

How many triangles are there on the puzzle below?

What does the below rebus riddle means?

The more of this there is, the less you see. What is it?

Find the missing number in the image below.

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

What you cannot hold but it is yours?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?