Respuesta :

There is 1/12 of the chocolate bar left.

Original is 11/12.
3/4.
4*3 = 12
So we multiply 3 by 3 as well
3*3 = 9
9/12
Daniel eats 9/12 of the chocolate bar.
11/12 - 9/12 = 2/12
Then he gives 1/12 to his sister. 
2/12 - 1/12 = 1/12
There is 1/12 of the chocolate bar left.

Hope this helps you! (:
-Hamilton1757