The only people in an auditorium are sophomores, juniors, and seniors. the ratio of the number of sophomores to the number of juniors in the auditorium is 4 to 3. the ratio of the number of juniors to the number of seniors in the auditorium is 5 to 7. the total number of people in the auditorium is 448. how many juniors are in the auditorium?

Let
x> the number of sophomores
y> the number of juniors
z> the number of seniors

we know that
x/y=4/3> x=(4/3)y> equation 1
y/z=5/7> z=(7/5)y> equation 2
x+y+z=448> equation 3

substitute equation 1 and equation 2 in equation 3
(4/3)y+y+(7/5)y=448> multiply by 15 both sides
20y+15y+21y=6720
56y=6720
y=120

the answer is
 the number of juniors is 120

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.

A: 0.26 would be the answer