There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

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

If you can spot the hidden clock quickly, you are often those with high IQs and exceptionally keen observation skills. You excel in noticing the finest details that others might miss and can process visual information at lightning speed.

How many triangles can you find in this given picture?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

What do you answer even though it never asks you questions?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

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