An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What can you hold in your right hand, but never in your left hand?

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.

What is the centre of gravity?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Solve the puzzle by telling what does below picture means.

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?