We can subtract the number of bulls from the total to get the number of cows, that is 18-3= 15. So the number of cattle in Kobayashi is 15. Calculated the number of cattle is several times that of cattle, that is, 15÷3=5. So the number of cows is five times that of bulls.

The information in the title gives the total number of cows and bulls in Xiaolin's family, and the number of cows can be obtained by simple subtraction. In mathematical problems, it is necessary to calculate and deduce according to known conditions to get the solution of the problem.