Answer:
The part of the stock owned by others is 3/18
Step-by-step explanation:
Rob owns 5/9 of the stock
And Talia half as much as Rob then Talia has:
(5/9) ÷ 2 = 5/18 of the stock
So Rob and his sister they both have
5/9 + 5/18 = ( 10 + 5 ) / 18 ⇒ 15/18
And the part of the stock owned by others is:
The total stock in term of fraction is 18/18 o 1 or 100 %
Then (18/18) - (15/18) = 3/18
