Using Only Five 5's and any mathematical operator make sum as 37

I have Rs.50 and I spend it in the way as below.

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?

Which tank will fill first?

What goes through cities and fields, but never moves?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

If eleven plus two equals one, what does nine plus five equal?