Câu 1: trang 180 - toán tiếng anh lớp 5A daughter's age is \(\frac{1}{4}\) the mother's age, and...

{
"answer1": "Let the mother's age be x. Then, the daughter's age is \(\frac{1}{4}\)x and the son's age is \(\frac{1}{5}\)x.",
"answer2": "Given that the sum of the daughter's age and the son's age is 18, we have \(\frac{1}{4}\)x + \(\frac{1}{5}\)x = 18.",
"answer3": "Solving the equation, we get \(\frac{9}{20}\)x = 18. Therefore, x = 40. So, the mother is 40 years old."
}