I travel all around the world but always stay in the corner. What am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

What number do you get when you multiply all of the numbers on a telephone's number pad?

What will you call your mother's brother's brother-in-law?

What is the difference between a jeweller and a jailer?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

What do you see in the given picture?

What number should come in place of the question mark below?