Yefim S. answered 09/16/20
Math Tutor with Experience
We have 8600x + 9800y + 6500z = 66100 or 86
86x + 98y + 65z = 661.
z must be odd.
Let try z = 1, then 86x + 98y = 596 and 43x + 49y = 298.
x can be 0,1, ...,8, y = 0,1,..,7. It not working
If z = 3,then 86x + 98y = 466 and 43x + 49y = 233
then x = 2 and y = 3 working
Answer x = 2, y = 3, z = 3