Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

What has a ring but no finger?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

What does this rebus riddle means ?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Can you write down eight eights so that they add up to one thousand?

What goes up but never comes down?

why number 8549176320 is one of a kind?

Before Mount Everest was discovered, what was the highest mountain in the world?