Answer: Yes.
Step-by-step explanation:
First ratio
5 : 15
Simplify (divide both sides by 5)
1 : 3
Second Ratio
3 : 9
Simplify (divide both sides by 3)
1 : 3
2/3(2/8 + 4/8) = 2/3(1/4 + 1/2)
2/3(3/4) = 1/2

and you know what that is.
Interest is 100*(2/100)
$2
Answer:
28 students
Step-by-step explanation:
Work backwards.
First, subtract 3:
115 - 3 = 112
Then, divide by 4:
112 ÷ 4 = 28
So, there are 28 math students in his class.