Answer :

 your answer for (11/7)(5/3)(3/1)  is 7.8571428571 and it is dividing and mulitplying.
First the numerator: 11*5*3=165

Then the denominator: 7*3*1=21
165/21 can be simplified:
165/3=55
21/7=3
Since three cannot go into 55 evenly you can leave it as a fraction: 55/3 or mixed number: 8 1/3