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?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

Count the number of triangles in the given picture.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

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

? : 3839 :: 11 : 1209

I know a nine-letter word having only one vowel.
Do you ?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

Why is the Hole below a Lock?