What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

What is the next number in the series?

15 29 56 108 208 ?

What does the below rebus riddle means?

How many letters are in the alphabet?

What has lots of eyes, but can’t see?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A sundial has the fewest moving parts of any timepiece. Which has the most?

Replace the question mark with the correct number.

what does this picture(rebus) riddle means ?