The age of the grandfather in years according to the task content is; 84.
What is the age of the grandfather?
It follows that the age of the grandfather and granddaughter are; x and y respectively.
Hence, the two equations which follow are;
x = 12y
x + y= 91
Hence, the age of the grandfather, x can be evaluated as follows;
x = 12(91-x)
13x = 1092
x = 1092/13
x = 84 years.
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