What is next number in the pattern below:

131 517 192 123 ?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

When is the top of a mountain similar to a savings account?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"