Sent by ROJO Alejandro, Lausanne (Switzerland).

16.- Among cows, sheep and chicken.

A master gave his servant 500 dollars for him to go to the market and buy 100 heads of cattle. He had to buy cows, sheep and chicken and spend all of the 500 dollars.

Once at the market, he realizes cows cost 25 dollars, sheep 5 dollars and chicken a quarter.

How many heads of cattle of each kind did he buy?