Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

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?

Can you solve the below tricky visual equation?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

What four weights can be used to balance from 1 to 30 pounds?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Prove that twice of ten is the same as twice of eleven.

There is a number which when you multiply by 3 and subtract 2 from the result, then the resulting number is the reverse of the actual number.

What is the smallest number that stands true on the statement?