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

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

What is the next number in this matchsticks series riddle?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

What can go up a chimney down, but can’t go down a chimney up?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

Through your logical capabilities, can you make 7 an even?

10+10 and 11+11 can give you the same answer.

Explain how?

People put me on the table and cut me but do not eat me. What am I?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?