What is the Surname of Barbie Doll?

What is the fastest way to double your money?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

Can you fill the blank with the correct number?

6 30 870 756030 _____

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

What is the word or phrase?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).