fractions; i suck at them and i just had a total blank on the most simple fraction sum.

1 - 1/9 = ?? plz help

1/5 of ?? = 6

and i have a kinda word prob,

if 5 * 3 = 4

2 * 8 = 2

6 * 3 = 3

find the value of

1 * 7 ??

im so stupid i know you think i am lol

please get back to me ASAP!!

thanks xoxo