16/80=x/100
Let's make the problem a little bit smaller.
Let's divie both the top and bottom of 16/80 by 8.
2/10=x/100
10 times what is 100? 10.
20/100=x/100
Multiply by 100 on both sides and you get 20=x
That gives you the percent of dogs that are golden retrievers.
Therefore, 20% of the dogs are golden retrievers.