What has no start, end, or centre?

In a basket of apples,
when counted in twos, there was one extra
when counted in threes, there were two extra when counted in fours, there were three extra
when counted in fives, there were four extra
when counted in sixes, there was five extra.

However, if the apples were counted in sevens, no extra apple was left. Can you calculate the minimum number of apples that were present in the basket?

You have a roll of cloth 1km long. You have a machine which cuts this roll into pieces of 10-meter-long cloth.

How long would it take for the machine to cut the roll if each cut took 4 secs?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Where do fish keep their money?

Solve the counting riddle by identifying the number of triangles in the given picture.

If 21x = 79x, what is the value of x?

If eleven plus two equals one, what does nine plus five equal?

Find the missing number in the image below.