Question

If 30% of a class consists of girls and there
are 21 boys in the class, then how many girls
are there in the class?​

Answer 1

Answer:

7girls..

Step-by-step explanation:

Let no. of students =x

%age of girls = 30%of x

No. of boys = 21

Percentage of boys =100-30

70%

70%of x =21

70/100*x=21

7/10*x=21

x=21*10/7

x=3*10

x=30

No of students =30

No of boys =21

No of girls =30-21

7 girls..

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Answer 2

Answer:

9 GIRLS

Step-by-step explanation:

30% are girls, then 70% are boys.

So, 70% = 21.

According to Observations, 10% is 3 students.

so 30% is 10% * 3 which is 3 * 3 = 9