khu vườn nhà bác ba nuôi ba con vật gồm heo , vịt và gà.gà chiếm 1/3 tổng hai con còn lại , vịt chiếm 7/5 tổng hai con vật còn lại . biết có 20 con heo . hỏi topngr tấy cả là bao nhiêu con vật

To solve this problem, we can use a system of equations to represent the given information. Let's denote the number of chickens as $$, the number of ducks as $$, and the number of pigs as $$. We are given that there are 20 pigs, so we have: $$ We also know that the total number of animals is the sum of chickens, ducks, and pigs: $$ From the given information, we can write two more equations: 1. The number of chickens is one-third of the total of the other two animals: $$ 2. The number of ducks is seven-fifths of the total of the other two animals: $$ Now we can substitute $$ into these equations and solve for $$ and $$. Then we can find the total by adding all three quantities together. Solving these equations will give us: $$ So, there are 30 chickens, 70 ducks, and 20 pigs in total. Therefore, the final answer is: $$