Bài 4: Trang 153 - sách giáo khoa (SGK) toán tiếng Anh lớp 4This year the son is 35 years younger...

Therefore, the son is 8/9 years old this year.

Now that we have found the father's age, we can find the son's age by substituting F back into the equation S = F - 35. So, S = 317/9 - 35 = 8/9.

From the given information, we can set up the equation F - 35 = 2/9. Solving this equation, we get F = 35 + 2/9 = 317/9.

Let the father's age be F and the son's age be S. We are given that S = F - 35 and S = 2/9. Therefore, F - 35 = 2/9.