A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

I shave every day, but my beard stays the same. What am I?

A beggar on the street can make one cigarette out of every 6 cigarette butts he finds. After one whole day of searching and checking public ashtrays the beggar finds a total of 72 cigarette butts. How many cigarettes can he make and smoke from the butts he found?

Rearrange the letters in "new door" to make one word.

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

In a school, there are four subjects. Seventy percent of students study English, seventy five percent of students study Science, eighty five percent of students study Mathematics and eighty percent of students study Spanish.

Can you calculate the percentage of students that study all four subjects?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H