How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

It is always ahead of me yet I can never see it. What is it?

What is the word or phrase?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

John, Jack and Jill are in a desert. John doesn't like Jill and hence decides to murder him. He poisons the water supply of Jill. Since it is a desert area, Jill must drink or he will die of thirst.

Jack does not know of the actions of John and also decides to murder Jill. To succeed in his ill motives, he removes the water supply of Jill so he dies of thirst.

Jill dies due to thirst. Who murdered Jill?

Using eight eights and addition only, can you make 1000?

What Time Should the last watch show in the below figure?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Count the squares in the matchstick puzzle below?