The text in the image asks the following question (translated from Dutch to English):

"In your school, the ratio of girls to boys is 3 to 5. There are a total of 168 students in the school. How many boys are there in this school?"

Solution:

Given:

• The ratio of girls to boys is $3:5$.
• Total number of students = 168.

Let's denote:

• The number of girls by $3x$,
• The number of boys by $5x$.

According to the problem, the total number of students is the sum of girls and boys:

$3x + 5x = 168$

$8x = 168$

Now, solve for $x$:

$x = \frac{168}{8} = 21$

Thus, the number of boys is:

$5x = 5 \times 21 = 105$

Answer:

There are 105 boys in the school.

Would you like more details or have any questions about this? Here are five related questions:

1. If the ratio of girls to boys was 4:5 instead, how many boys would there be in the school?
2. How many girls are there in the school based on the current ratio?
3. What is the percentage of boys in the school?
4. If 20 new girls join the school, what will be the new ratio of girls to boys?
5. If the total number of students increased to 200 while keeping the same ratio, how many boys would there be?

Tip: When working with ratios, it's helpful to express the total amount as a sum of parts based on the ratio, and then solve for the variable representing one part.