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?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What time is it when an elephant sits on a fence?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Can you tell a 3D object that has just two surfaces?

A father's child, a mother's child, yet no one's son.

Who am I?

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?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?