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

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

What is full of holes but still holds water?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?