Question

$\large \textbf {A \: student \: rank \: 19th\: in\:the\:class\:of\:50\\what \: is \: his\: rank\:from\:the\:last?}$

Answer 1

◀ HEY THERE!◀

◀  Question: ◀

→  A student is ranked 19th in a class of 50.what Is his rank from the last?

Method of Solution:

→ Given:

⇒  Total Student in the Class = 50

⇒  Student rank = 19th

→  To Find:

⇒  Rank From the last = ?

There are two method to solve this type of Questions.

→  Method l : (Solving by Alternative Method)

→  Let the rank from last or end be x ,

Rank From Start + Rank From Last = Total Number of Students + 1

  ⇒ 19 + x = 50+1

⇒  19+x = 51

⇒ x =51-19

⇒  x = 32

→  Therefore, 32th rank from from the last.

◀  Method ll: ◀

Given:

⇒  Total Student in the Class = 50

⇒  Student rank = 19th

Lets find How many students behind him/she,

Total Student- Student Rank

⇒  = 50- 19

⇒  31

→ Concept: It's means 31 Student behind that Student.

Student from end + 1

⇒  31 + 1

→   ◀ Thus ,it meant 32 Student from the last.◀

Answer 2

As 19 + x( rest students) = 50

x= 31

So rank of 19 th student from the last is 31 + 1 = 32 th rank

OR

A student is at 19 th position

and total 50 students

As we know if x1,x2,.........xn students are there , obviously there are n students OR

so to find no of students it's ( xn - x1 +1)

So to find position of 19 th student from last

simply calculate no of students from 19 th position

19, 20,.........50

So it's (50-19) + 1 = 31+ 1 = 32



⚡⚡⚡⚡Dhruv⚡⚡⚡⚡⚡⚡⚡