Question 1179541
The sum of three numbers is 87 .

let the numbers be x,y,z

x+y+z=87 ---------------------------(1)


 The second number is 2 times the third.
y=2z

 The first number is 9 less than the third.

x = z-9

substitute y & z in (1)
z-9 +2z +z =87

4z-9 = 87
4z = 96
z= 24

knowing z you can find x & y

  the numbers