Question

What is counted on Friday?

Days	Tally	Total
Monday	$\not{{\parallel \parallel }}{\text{ }}\not{{\parallel \parallel }}{\text{ }}\not{{\parallel \parallel }}$
Tuesday	$$\not{{\parallel \parallel }}{\text{ }}
Wednesday	$\not{{\parallel \parallel }}{\text{ }}\not{{\parallel \parallel }}$
Thursday	$$\not{{\parallel \parallel }}{\text{ }}	$$
Friday	$\not{{\parallel \parallel }}{\text{ }}\not{{\parallel \parallel }}{\text{ }}\parallel$

$\left( A \right){\text{ }}5$
$\left( B \right){\text{ 6}}$
$\left( C \right){\text{ 12}}$
$\left( D \right){\text{ 8}}$

Answer 1

The tally marks for each day is given to us. As we have to find the count on Friday, therefore we will count it. To do this first we have to learn how to count the tally marks. $\not{{\parallel \parallel }}$ is counted as five , $|$ is counted as one, $\parallel$ is counted as two and so on. By using this you will be able to get the count on Friday.

Complete answer: Tally marks is the easiest topic. Generally, tally marks are used to keep and count the score. The symbol ‘|’ is used to denote the value one. The general way of writing tally marks is as a group or set of five lines. The first four lines are drawn vertically and each of the fifth line runs diagonally over the previous four vertical lines that is from the top of the forth line to the bottom of the first line as shown below:
$\not{{\parallel \parallel }}$
Now let’s see that how to count the tally marks. Tally marks are the fastest way of keeping track of numbers in groups of five. Now see below to understand the logic.
$| = 1$
$\parallel {\text{ }} = {\text{ }}2$
$||| {\text{ }} = {\text{ }}3$
$\parallel \parallel {\text{ }} = {\text{ }}4$
$\not{{\parallel \parallel }}{\text{ }} = {\text{ }}5$
$\not{{\parallel \parallel }}{\text{ }}|{\text{ }} = {\text{ 5 + 1 = 6}}$ and so on….
Now in the question, the days are given to us along with their tally marks. Now what we have to do is we have to find the count on Friday, that is we have to count the tally marks given for the Friday.
We know that tally marks are given by counting the total number of vertical and slant lines. Therefore, from the given table we can observe that the tally marks given for Friday is
$\not{{\parallel \parallel }}{\text{ }}\not{{\parallel \parallel }}{\text{ }}\parallel$
On counting the above tally marks by keeping in mind the rules we have
$\Rightarrow {\text{ }}5 + 5 + 2$
On adding it becomes
$\Rightarrow {\text{ 1}}2$
Therefore, the count on Friday is ${\text{1}}2$ .
Hence, the correct option is $\left( C \right){\text{ 12}}$

Note:
Keep in mind that for the number five draw four vertical lines with a diagonal line through it. Make sure that the diagonal is always made from the top right corner to the bottom left corner only. Note that tally marks are denoted by a single vertical bar ‘|’ .