Answer:
Step-by-stefdfgp explanation:
5(x-1) + 3 = 13
5x - 5 + 3 = 13
5x -2 = 13
5x = 15
x = 15/5
x = 3
30 students in a class ; 16 are boys
Girls to boys : to find the amount of girls, simply subtract the student total with the boy total.
30 - 16 = 14
Therefore there are 14 girls in the class
So, our ratio should be ~ 14 : 16
Girls to all students :
Girls is 14 students is 30
Therefore the ratio to girls to all students is ~ 14 : 30
Boys to girls : Simply get the boys amount to the other side of the girls amount
Therefore the ratio of boys to girls is ~ 16 : 14
Boys to all students : Get the amount of boys and the amount of all students to the opposite side of each other.
Therefore the ratio of boys to all students is ~ 16 : 30
~Hope I helped
360 is the answer
1. 36/3 = 12
2. 12 x 4 = 48
3. 12 + 48 + 300 = 360