What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I am 5 letters long.
My first two tell you who I am
My first 3 could be a medicine
My last three reversed could be a young boy.
My 4th, 3rd and 2nd in that order could be a fruit drink.
If you have me you may hang me round your neck
WHAT AM I ?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

81 x 9 = 801. What must you do to make the this equation true?

Solve the following series:
AZ, GT, MN, __, YB

Why despite killing dozens of people Charley and Wilma were not punished?

Replace the question mark with the correct number in the below-given picture?

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?

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?