Question

EXERCISE 8.1

3. 72% of 25 students are interested in mathematics. How many are not interested​

Answer 1

$\huge\underbrace\mathbb\purple{Answer}$

Answer = 7

Given

• Students who are interested in mathematics is 72% of 25

To find:

• Not Interested students in mathematics

Solution :

⇒ 72 /100 × 25

⇒ 18

∴ Students not interested in mathematics

⇒25-18 = 7

Answer 2

Answer:-

Number of students not interested in mathematics are 7 students.

Step-by-step explanation:-

First let's find number how students are interested in mathematics :-

$\longrightarrow \: \sf{ \dfrac{72}{100} \times 25 }$

By Dividing 100 and 25 with 5

$\longrightarrow \: \sf{ \dfrac{72}{20} \times 5}$

By dividing 20 and 5 with 5

$\longrightarrow \: \sf{ \dfrac{72}{4}}$

By dividing 72 and 4 with 2

$\longrightarrow \: \sf{ \dfrac{36}{2}}$

By dividing 36 and 2 with 2

$\longrightarrow \: \sf{18}$

$\underline{ \sf{ \therefore \:No. \: of \: \: students \: \: are \: \: interested = 18 }}$

Now, let's find number of students are not interested are :-

$\longrightarrow \: \sf{(25 - 18) \: students}$

$\longrightarrow \: \sf{7 \: students}$

Required Answer:-

• 7 students are not interested in mathematics.