Can you make a six-letter word using the letters N, A and B ?

Prove that the below maths equation is true.

8 + 8 = 91

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

What breaks yet never falls, and what falls yet never breaks?

What is next number in the pattern below:

131 517 192 123 ?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

People are waiting in line to board a 100-seat aeroplane. Steve is the first person in the line. He gets on the plane but suddenly can't remember what his seat number is, so he picks a seat at random. After that, each person who gets on the plane sits in their assigned seat if it's available, otherwise, they will choose an open seat at random to sit in. The flight is full and you are last in line. What is the probability that you get to sit in your assigned seat?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

The more of this there is, the less you see. What is it?