In a school, 5/8 of the students are boys. If there are 240 girls, find the number of boys in the school.
n = number of students in the school
b = number of boys in the school
g = number of girls in the school
If 5 / 8 of the students are boys then:
1 - 5 / 8 = 8 / 8 - 5 / 8 = 3 / 8 of the students are girls.
b = 5 / 8 n
g = 3 / 8 n
There are 240 girls so:
g = 240
3 / 8 n = 240
Multiply both sides by 8
3 n = 1920
n = 1920 / 3 = 640
There are 640 students in a school.
b = 5 / 8 n = 5 / 8 ∙ 640 = 3200 / 8 = 400
There are 400 boys in a school.
total ---- x
boys ---- (5/8)x
girls ---- (3/8)x
(3/8)x = 240
x = 640
finish it up