Anyone who can answer to this?

In a survey of cats eating habits, 10% of the cats tested showed a clear preference for Moggiemeat, 20% preferred Fuss-Puss and 40% preferred Yummy Paws. An additional 6 cats did not seem to care at all which of the three foods they ate, while the remaining 27 cats in the survey would not touch any of these foods.

How many cats were involved in the survey?

As 30% are 33 cats.
70% of them are 77 .
They are totally 110