A farmer went to your bank to ask for a loan. The bank agreed on offering $100 as long as the farmer would be able to buy exactly 100 animals with those $100. The only rule of the agreement was that the farmer would buy at least one of each of the following animals: ox, pigs and sheeps. Each ox costs $10. Each pigs costs $3, and the sheeps costs, each, $0.50. How many animals of each kind did the farmer buy?
