49.5k views
4 votes
* 24% of students in a class are girls. If there are less than 30 students in this class, how many students are there? How many girls are there?

User Abel
by
7.4k points

2 Answers

3 votes

Answer:

8

Explanation:

Make a proportion: 24/100 = x/30. Now you need to find x. You could simplify 100 and 30 since they have a common factor of 10. 100/10=10 and 30/10=3. So now you have 24/10 = x/3. Now it is easier to cross multiply. Once you cross multiply you would get 7.2. You cant have 7.2 girls so round to 8.

User Muthurathinam
by
8.5k points
3 votes

Answer:

25 students

6 girls

Explanation:

The problem can be solved by calculating the greatest common factor (GCF) between 24 and 30 (since it is 24% and less than 30 students).

For 24:

1x24

2x12

3x8

4x6

Factors of 24 = 1,2,3,4,6,8,12,24

For 30:

1x30

2x15

3x10

5x6

Factors of 30 = 1,2,3,5,6,10,15,30

GCF = 6

Then, we can conclude that 30/6 is the fraction of reduction which must be subtracted from 30, so to know how many students there are we apply the following formula:

30 - 30/6 = 30 - 5 = 25

The number of girls is calculated as follows:

25 x 24% = 25 x 0.24 = 6

In summary, there are 25 students, of which 6 are girls

Hope this helps!

User Varun Kumar
by
7.0k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.