If eleven plus two equals one, what does nine plus five equal?

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?

If two's company, and three's a crowd, then whats four and five ?

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

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What does the below rebus riddle means?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?