Answer:
Grampa Gump would be 80 year's old
Explanation:
Since the question said that you have to divide Grampa Gump age by 16 you'd get juniour's Age so if you multiply juniour's age by 16 you'd get Grampa Gump age
grampa gump=gg
junior gump=jg
gg/16=jg
jg=5
gg/16=5
gg=80 years old
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