Why 1729 is a magic number? Answer Logically.

I’m tall when I’m young, and I’m short when I’m old. What am I?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Who always enjoys poor health?

What is the coolest letter in the alphabet?

who is silent in the parliament?

What am I?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

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?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?