Question

In the class of 60 students 30% are boys
Find the number of girls ?
​

Answer 1

Answer:

42 no of girls

Step-by-step explanation:

30/100X60=18= no of boys

60-18=42= no of girls

Answer 2

To Find:

• Number of girls in the class ......(?)

Solution:-

Given that,

In a class there are 60 students and 30% are boys

Therefore, Number of girls are:-

Method 1

First let's find number of boys:-

$\longrightarrow \: \dfrac{30}{100} \times 60$

Dividing 100 and 60 with 2

$\longrightarrow \: \dfrac{30}{50} \times 30$

Dividing 50 and 30 with 2

$\longrightarrow \: \dfrac{30}{25} \times 15$

Dividing 25 and 15 with 5

$\longrightarrow \: \dfrac{30}{5} \times 3$

Dividing 30 and 5 with 5

$\longrightarrow \: 6 \times 3$

$\longrightarrow \: 18$

Therefore, 18 students are boys in the class.

Now,

No. of girls = Total no. of students - No. of boys

= 60 - 18

= 42

∴ Number of girls is 42.

Method 2

Given that,

In a class there are 60 students and 30% are boys

Therefore, Number of girls are:-

First let's find the percentage of girls in the class:-

= ( 100 - 30 )%

= 70%

Now, number of girls are:-

$\longrightarrow \: \dfrac{70}{100} \times 60$

Dividing 70 and 100 with 10

$\longrightarrow \: \dfrac{7}{10} \times 60$

Dividing 10 and 60 with 10

$\longrightarrow \: 7 \times 6$

$\longrightarrow \: 42$

Therefore, number of girls are 42.