Can you find the odd number in the following?

2716, 4135, 5321 and 7145

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

Take one out and scratch my head, I am now black but once was red. What am I?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

You need to remove two matchsticks to make the below equation true. Can you do it ?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

John was piloting a plane behind a car but was never able to overtake it. Why?

Find the missing letter in the last circle logically in the given below picture.

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?