Can you find the odd number in the following?

2716, 4135, 5321 and 7145

Who always enjoys poor health?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

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!!!

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Imagine you are in a room with no windows or doors. How will you get out?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

The more you take me, the more you leave me behind.
Who Am I?