Can you replace the question mark with the correct number in the below table sequence?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What has many teeth, but cannot bite?

Nodes are shown below and you need to connect them based on the following rule: Every node can be connected to the number of nodes inside them, i.e. the first node there is a value of 1 which indicates that the first node can connect to exactly one node only.Can you do it?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

What is red and smells like blue paint?

Can it be possible to build a house that has all its four walls facing towards the South?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?