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

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

How many times can you subtract the number 5 from 25?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

When 99 is considered higher than 100?

What is the next number in the series?

15 29 56 108 208 ?

I can be cracked, made, told, and played. What am I?

Count the number of lines in the image below ?

If,

20 % 5 = 24

21 % 7 = 33

42 % 6 = 67

Then;

66 % 6 = ?