According to the given data we have the following:
sum of three numbers=89
second number=3 times the third, so second number=3x
let the third number be equal x
first number=9 more than the third, so first number=x + 9
So, if sum of three numbers=89, then:
x+9 + 3x +x=89
5x=89-9
5x=80
x=80/5
x=16
So, if x=16, then, first number=x + 9=16+9=25
second number=3(16)=48
third number=16
