Complete the table series riddle by finding the number that can replace "??".

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

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What came first, the chicken or the egg?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

The husband and wife were jogging in the morning. To match every two steps of the husband, the wife required three steps. If Both of them start with the here right foot. After how many steps do their left foot be together?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

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?