I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

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

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?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What is the next number in this matchsticks series riddle?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

What is more useful when it is broken?