What number comes next in this sequence:
7 8 5 5 3 4 4 _

What has many keys but can’t open a single lock?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Can you find the dog hidden in a group of pandas?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

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

which number am I?