The ratio of forks to knives in Kim's kitchen drawer is 4 to 5. There are 16 forks in the drawer. of 3. The How many knives are there?

I cant quite understand the question but if the 'of 3' is not there then:

If there are 16 forks and a ratio of 4 to 5 you can calculate how any 'sets' are in the 16 by doing 16/4 which is 4. Times this by 5 as we have 4 sets and need to know how many knives. Therefore you have 20 knives.