Question

.If 65 percentage of 140 students of class VIII are good in mathematics.How many students are not good in mathematics​

Answer 1

Answer:

• 49 students are not good in mathematics.

Step-by-step explanation:

Given that:

• Total number of students in class VIII = 140 students
• Percentage of students good in mathematics = 65%

To Find:

• How many students are not good in mathematics.

Let the x number of students are not good in mathematics.

First finding the number of students good in mathematics:

Formula: Students good in maths = Total students × Percentage of students good in maths

• Students good in maths = 140 × 65%
• Students good in maths = 140 × 65/100
• Students good in maths = (140 × 65)/100
• Students good in maths = 91

Finding the value of x:

Formula: Students good in maths + Students not good in maths = Total students

• Putting the values.

→ 91 + x = 140

→ x = 140 - 91

→ x = 49

∴ Number of students are not good in mathematics = 49

Answer 2

Answer:

Question :-

If 65 percentage of 140 students of class VIII are good in mathematics. How many students are not good in mathematics ?

Answer :-

• Number of students that are not good in mathematics are 49.

Given :-

• Total number of students in class VIII = 140 students.
• Percentage of students that are not good in mathematics = 65%.

To find :-

• We have to find the number of students that are not good in mathematics.

Step-by-step explanation :-

• Let the number of students that are not good in mathematics be x.
• As we are given that the total number of students in class is 140.
• Then firstly, we will find out the number of students that are good in mathematics.
• So, by using the required formula we will find out the number of students that are good in mathematics.

Required formula is as follows :-

${\underline{\boxed{\sf {Students\ good\ in\ mathematics\ =\ Total\ students \times Percentage\ of\ students\ good\ in\ mathematics}}}}$

Here,

• Total students = 140.
• Percentage of students good in mathematics = 65%.

By applying the values, we get :-

$\sf \mapsto {Students\ good\ in\ mathematics\ =\ Total\ students \times Percentage\ of\ students\ good\ in\ mathematics}$

$\sf \mapsto {Students\ good\ in\ mathematics\ =\ 140 \times 65 \%}$

$\sf \mapsto {Students\ good\ in\ mathematics\ =\ 140 \times \dfrac{65}{100}}$

$\sf \mapsto {Students\ good\ in\ mathematics\ =\ \dfrac{(140 \times 65)}{100}}$

${\therefore{\underline{\boxed{\tt {Students\ good\ in\ mathematics\ =\ 91.}}}}}$

• Now we have the number of students that are good in mathematics.
• So, by using the required formula we will find out the number of students that are not good in mathematics.

Required formula is as follows :-

${\underline{\boxed{\sf {Students\ good\ in\ mathematics\ +\ Students\ not\ good\ in\ mathematics\ =\ Total\ students}}}}$

Here,

• Students good in mathematics = 91.
• Total students = 140.

By applying the values, we get :-

$\sf \mapsto {Students\ good\ in\ mathematics\ +\ Students\ not\ good\ in\ mathematics\ =\ Total\ students}$

$\sf \mapsto {91\ +\ x\ =\ 140}$

$\sf \mapsto {x\ =\ 140\ -\ 91}$

$\sf \mapsto {x\ =\ 49}$

${\therefore{\underline{\boxed{\tt {Number\ of\ students\ not\ good\ in\ mathematics\ =\ 49.}}}}}$