Rambo says to Shyambo - I'll take the last goat, you can have the chicken. Shyambo says - No way! A chicken costs less than a goat! Rambo says - I'll also give you one of my dogs and we will be even. Shyambo agrees. How much does a dog cost? The question clearly states that to make even Rambo gives one dog. So, it clearly implies 1 goat = chicken + dog.