In a class of 30 student, 2/5 are boys. How many girls are in the class?

To find how many girls are in the class, we can first determine the number of boys and then subtract that from the total number of students.

### Step 1: Find the number of boys
The fraction of boys in the class is \( \frac{2}{5} \), so:
\[
\text{Number of boys} = \frac{2}{5} \times 30 = 12
\]

### Step 2: Find the number of girls
Now, subtract the number of boys from the total number of students:
\[
\text{Number of girls} = 30 - 12 = 18
\]

Thus, there are **18 girls** in the class.

Would you like further explanation or have any other questions?

Here are 5 related questions to explore:

1. If the ratio of boys to girls was \(3:2\), how many boys would there be?
2. What percentage of the class are boys?
3. If 4 more boys joined the class, what would the new ratio of boys to girls be?
4. If 10 students left, but the fraction of boys stayed the same, how many boys and girls would remain?
5. If \(3/5\) of the students are girls, how many boys are in the class?

**Tip:** Always cross-check your fraction-based answers by verifying the total after adding the parts together!

In a class of 30 students, 2/5 are boys. How many girls are in the class?

In this math problem, you will learn how to find the number of girls in a class of 30 students, given that 2/5 are boys. This step-by-step solution demonstrates how to use fractions and basic arithmetic to solve real-world problems. Perfect for students in Grades 5-7.

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