Find the missing number in the series below

13 -21 34 -55 ? -144

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

You need to remove two matchsticks to make the below equation true. Can you do it ?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

what does this picture(rebus) riddle means ?

Kareena is older than Bipasha. Bipasha is younger than Karishma and younger than Katrina. Katrina is older than Kareena and Alonso, who are older than Karishma.If Alonso and Kareena are twins, who's oldest?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

what does the below rebus mean?