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.
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.
