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?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

Find the next number in the following series:
6, 14, 26, 98, __?

No matter how little or how much you use me, you change me every month. What am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?