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?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Which fur should we be getting from the Lion?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What work can one never finish?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?