The ratio of boys to girls students in a certain high school is 4:5. If the total number of students in the school is 1260, find the number of boys in the school.

Let the number of boys be 4x and the number of girls be 5x.

According to the given ratio, 4x + 5x = 1260
9x = 1260
x = 140

Therefore, the number of boys in the school is 4x = 4 * 140 = 560.

So, there are 560 boys in the school.

Let's assume the number of boys be 4x and the number of girls be 5x, where x is a common factor.

According to the given ratio, 4x + 5x = 1260
⇒ 9x = 1260
⇒ x = 1260/9
⇒ x = 140

Therefore, the number of boys in the school is 4x = 4 - 140 = 560.