Fraction of shampoo left = 
Solution:
Given fraction of full shampoo
.
Fraction of shampoo Margaret used 
Fraction of shampoo left = Full shampoo – fraction of shampoo used

To make the denominators same do cross multiplication.




Hence
of the shampoo bottle is left.
X+11=3
-11 -11
x=-8
you subtract 11 from both sides. then you got the answer.
12.8 is the answer to this problem