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Alice's grandmother age is a composite number between 70 and 80. This number has a factor of 11. What number is it ?

Verified Answer :

the answer is 77 because the only thing in between 70 and 80 with the factor of 11 is 77

The number would have to be 77 because between 70 and 80, 77 is the only number that is a product of eleven.