Answer Posted / shankaragowda b.b.

y=2x
x=3z
z=x/3
(x+y+z)/3=20
(x+2x+(x/3)/3=20
(3x+6x+x)/9=20
10x=180
x=18
y=18*2=36
z=x/3=18/3=6

Greatest no is 36 (y).

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