Calculating the Number of Girls in the Class

Oct 13, 2025 by wbrum.org 55 views

Calculating the Number of Girls in the Class

In this problem, we are given a ratio of boys to girls in a class as 13:14 and a total number of pupils as 135. We need to calculate the number of girls in the class.

Understanding the Ratio

The given ratio of boys to girls is 13:14. This means that for every 13 boys, there are 14 girls in the class. We can represent this ratio as a fraction, where the number of boys is 13x and the number of girls is 14x, where x is a common multiplier.

Calculating the Total Number of Pupils

We are given that the total number of pupils in the class is 135. We can use this information to find the value of x.

Let's assume that the number of boys is 13x and the number of girls is 14x. The total number of pupils is the sum of the number of boys and the number of girls, which is 13x + 14x = 27x.

Since the total number of pupils is 135, we can set up the equation:

27x = 135

To solve for x, we can divide both sides of the equation by 27:

x = 135 / 27 x = 5

Calculating the Number of Girls

Now that we have found the value of x, we can calculate the number of girls in the class. The number of girls is 14x, so we can multiply 14 by 5 to get the number of girls:

Number of girls = 14x = 14(5) = 70

Therefore, there are 70 girls in the class.

Conclusion

In this problem, we used the given ratio of boys to girls and the total number of pupils to calculate the number of girls in the class. We found that the number of girls is 70.

Example Use Case

This problem can be used to demonstrate the concept of ratios and proportions in mathematics. It can also be used to calculate the number of girls in a class based on the given ratio and total number of pupils.

Tips and Tricks

When working with ratios, it's essential to identify the common multiplier (x) to find the value of each part of the ratio.
To calculate the number of girls, multiply the number of girls in the ratio (14) by the value of x.
Make sure to check your calculations and use the correct values to avoid errors.

Calculating the Number of Girls in the Class

In this problem, we are given a ratio of boys to girls in a class as 13:14 and a total number of pupils as 135. We need to calculate the number of girls in the class.

Understanding the Ratio

Calculating the Total Number of Pupils

We are given that the total number of pupils in the class is 135. We can use this information to find the value of x.

Let's assume that the number of boys is 13x and the number of girls is 14x. The total number of pupils is the sum of the number of boys and the number of girls, which is 13x + 14x = 27x.

Since the total number of pupils is 135, we can set up the equation:

27x = 135

To solve for x, we can divide both sides of the equation by 27:

x = 135 / 27 x = 5

Calculating the Number of Girls

Now that we have found the value of x, we can calculate the number of girls in the class. The number of girls is 14x, so we can multiply 14 by 5 to get the number of girls:

Number of girls = 14x = 14(5) = 70

Therefore, there are 70 girls in the class.

Conclusion

In this problem, we used the given ratio of boys to girls and the total number of pupils to calculate the number of girls in the class. We found that the number of girls is 70.

Example Use Case

Tips and Tricks

When working with ratios, it's essential to identify the common multiplier (x) to find the value of each part of the ratio.
To calculate the number of girls, multiply the number of girls in the ratio (14) by the value of x.
Make sure to check your calculations and use the correct values to avoid errors.

Q&A: Calculating the Number of Girls in a Class

Q: What is the ratio of boys to girls in the class?

A: The ratio of boys to girls in the class is 13:14.

Q: How many pupils are in the class?

A: There are 135 pupils in the class.

Q: How do I calculate the number of girls in the class?

A: To calculate the number of girls, you need to find the value of x by dividing the total number of pupils by the sum of the parts of the ratio (13 + 14 = 27). Then, multiply the number of girls in the ratio (14) by the value of x.

Q: What is the value of x?

A: The value of x is 5.

Q: How many girls are in the class?

A: There are 70 girls in the class.

Q: What if the ratio of boys to girls is different?

A: If the ratio of boys to girls is different, you need to adjust the calculation accordingly. For example, if the ratio is 15:16, you would use 15x and 16x instead of 13x and 14x.

Q: Can I use this method to calculate the number of boys in the class?

A: Yes, you can use this method to calculate the number of boys in the class by multiplying the number of boys in the ratio (13) by the value of x.

Q: What if I make a mistake in my calculation?

A: If you make a mistake in your calculation, you may get an incorrect answer. Make sure to check your calculations and use the correct values to avoid errors.

Q: Can I use this method to calculate the number of pupils in a class with a different ratio?

A: Yes, you can use this method to calculate the number of pupils in a class with a different ratio by adjusting the calculation accordingly.

Q: What if I need to calculate the number of girls in a class with a different total number of pupils?

A: If you need to calculate the number of girls in a class with a different total number of pupils, you can use the same method by adjusting the calculation accordingly.

Q: Can I use this method to calculate the number of girls in a class with a different ratio and total number of pupils?

A: Yes, you can use this method to calculate the number of girls in a class with a different ratio and total number of pupils by adjusting the calculation accordingly.