Whole Numbers Mathematics Puzzles Set 1

Tom walks half a distance at 4 mph and runs back the other half at 12 mph. What is his average speed for the entire trip?

 If 32 people were to enter a statewide singles tennis tournament, how many matches would be played, including the championship?

Below is a sequence where the difference between each successive pair of numbers is 6. What is the 500th number in this sequence? 5 11 17 23 29 35 41 . . …

In a laboratory, two subatomic particles are being crashed into each other as part of an experiment. Particle #1 is moving directly toward particle #2 at 15 mers a second. Particle #2 is moving directly toward particle #1 at a speed of 25 mers a second. The particles are 1,000 mers apart when they begin moving. What will be the distance between them 1 second before they crash?

If one can of dog food feeds eight pups or six dogs, then eight cans of  the same dog food will feed 40 puppies and how many dogs? Be careful 

with the puzzle. It is asking for puppies and dogs, not puppies or dogs.

What is the missing number?

5, 25, 125, ? ,125, 15,625, …..

One of the numbers below does not belong with the others for a 

simple, straightforward reason. Which is the odd one out?

13,754, 14,933, 16,283, 16,637, 16,175, 18,91

 How many zeros does a thousand thousand million have?

What is the missing number in the sequence below? 

13, 57, 91, 11, 31, 51, ?

If you write down all the numbers from 1 to 100, how many total single digits will you have written down? Include both 1 and 100.