Question

1/2 divided by N equals 1/3
what is N?

Answer 1

1/2 divided by n = 1/3

Inverse operation

1/2  /  n = 1/3
        *n    *n 

1/3 reciprocal is 3/1

1/2 * 3/1 = n
3/2 = n

n = 1 and 1/2

Answer 2

You said that                          (1/2)  /  N  =  1/3

Multiply each side by 'N' :      (1/2)          =  1/3 N

Multiply each side by  3 :        3/2           =        N

                                   or        1-1/2         =       N .