If you add 1/3 of a number to the number itself you get 16 what is the number
15 2/3
If the number is =N, then:
N + 1/3N =16
1 1/3N =16
4/3N=16
N=16 / (4/3)=16 x 3/4
N=48/4
N=12, so that:
12 + (1/3 x 12)=12 + 4 =16