There are 55% boys in a class. If the number of girls is 315, how many more boys are there compared to girls?

Let's solve this step by step.

### Step 1: Determine the percentage of girls in the class.
Since 55% of the students are boys, the percentage of girls will be:
\[
100\% - 55\% = 45\%
\]

### Step 2: Calculate the total number of students.
Let the total number of students be \( T \).
Given that 45% of the students are girls and there are 315 girls, we have:
\[
0.45T = 315
\]
To find \( T \):
\[
T = \frac{315}{0.45} = 700
\]

### Step 3: Calculate the number of boys.
Since 55% of the students are boys:
\[
\text{Number of boys} = 0.55 \times 700 = 385
\]

### Step 4: Find the difference between the number of boys and girls.
\[
\text{Difference} = 385 - 315 = 70
\]

So, there are 70 more boys than girls in the class.

Would you like to see more details, or do you have any questions?

Here are some related questions:
1. What is the total number of students if there are 70 more boys than girls and 315 girls?
2. If 40% of the students are girls, how many girls would there be in a class of 700 students?
3. If there are 385 boys in a class, what percentage of the students are boys?
4. How would the difference between boys and girls change if the number of girls increased to 350?
5. If the ratio of boys to girls is 7:6, how many girls are there in a class of 700 students?

**Tip:** Always double-check your calculations, especially when dealing with percentages, to ensure accuracy.

Learn how to solve a math problem involving percentages and algebraic calculations. Given that there are 55% boys in a class and 315 girls, find out how many more boys there are compared to girls. Step-by-step solution provided.

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