Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

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x *
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In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

If Rajina's daughter is my daughter's mom, who am I to Rajina?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

A doctor and a boy were fishing. The boy was the doctor’s son, but the doctor was not the boy’s father. Who was the doctor?

What is so fragile that saying its name breaks it?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What happened when the wheel was invented?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?