Answer:
10% of the school are blonde haired boys.
Step-by-step explanation:
Let x be the total number of students,
Number of students who have blonde hair = 40% of the total students
= 40% of x
= 0.4x
Also, the ratio of three times as many girls as boys have blond hair,
So, the ratio of blond hair boys and blond hair girls = 1 : 3
Let the number of boys who have blonde hair = y
And, the number of girls who have blonde hair = 3y
So, y + 3y = 0.4x
4y = 0.4x ⇒ y = 0.1x
Thus, the number of boys who have blonde hair = 0.1x
Hence, the percentage of the school are blonde haired boys
= [tex]\frac{0.1x}{x}\times 100=10\%[/tex]
