Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

You have two jars of chocolates labelled as P and Q. If you move one chocolate from P to Q, the number of chocolates on B will become twice the number of chocolates in A. If you move one chocolate from Q to P, the number of chocolates in both the jars will become equal.

Can you find out how many chocolates are there in P and Q respectively?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

John can fit six large chocolate boxes or nine small chocolate boxes into a carton. How many cartons will he require to put sixty-six chocolate boxes into?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?