Problem solving process:
If the unit number is X and the decimal number is x-3, then the age is10 (x-3)+x =11x-30.
According to the unit square and the life symbol, the age is x square.
So the column equation
The square of x = 1 1x-30
The square of x-1 1x+30=0.
(x-5)(x-6)=0
X=5 or x=6.
X=5 years old, 25 years old
So x=6,
So the age is 36.
A: Zhou Yu died at 36.