Question

Mrs.fisher has 91 watches on display at her store. She says she can arrange them into rows and colums without any watch left over. Mr.fisher says she can only make 1 row with all 91 watches who is correct?explain.

Answer 1

This is a question of whether 91 is a prime number or not. And it is not so Mrs. Fisher is right, you can arrange them in 7 rows and 19 columns or vice versa. 7 and 13 are factors of 91.