Question 1123156
 x + y + z = 30
xyz = 640.
find x, y and z 
:
Use the try and see method
Prime factor 640, 2*2*2*2*2*2*2*5
We know all the factors are less than 30
16 * 4 * 10 seems to work
x = 4
y = 10
z = 16