Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You bought me for dinner but never eat me. What am I?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

A sundial has the fewest moving parts of any timepiece. Which has the most?

What is the next number in the series?

15 29 56 108 208 ?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Can you count the number of squares in the given picture?