Final answer:
To find the number of girls in the school, we set up a proportion using the ratio of boys to girls. We then solve the equation to find that there are 525 girls in the school.
Step-by-step explanation:
To find the number of girls in the school, we need to use the ratio of boys to girls, which is 4 to 5.
We can set up a proportion to solve the problem: boys/girls = 4 / 5.
Let's represent the number of girls as x. The number of boys would then be 4/5 * x.
We know that the total number of students in the school is 945, so we can set up another equation: x + 4/5 * x = 945.
Simplifying the equation, we get 9/5 * x = 945.
To solve for x, we divide both sides of the equation by 9/5: x = 945 ÷ (9/5) = 525.
Therefore, there are 525 girls in the school.