Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

You see me once in June, twice in November, and not at all in May. What am I?

O_er_t_o_

Complete the missing letters of the given word.

A bank customer had $100 in his account. He then made 6 withdrawals. He kept a record of these withdrawals, and the balance remaining in the account, as follows:

Withdrawals Balance left
$50 $50
$25 $25
$10 $15
$8 $7
$5 $2
$2 $0
----- -----
$100 $99

Why are the Totals not tallying?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Count the number of triangles in the picture below:

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?