Đề ôn tập Toán song ngữ Anh - Việt - Đề số 35 (Vòng Quốc gia 2025-2026)

There are 5 students: Alice, Bruno, Claude, Daniel, and Emily. Alice is 5 years old. Bruno is 17 years old. Claude, Daniel, and Emily have the same age. If the average age of these 5 students is 8, how old is Daniel?

There are a total of 28 chickens and rabbits in a farm. The animals have a total of 72 legs. How many chickens are there?

It requires 72 minutes to cut a piece of wood into 9 sections. If the time for each cut is the same, how many minutes are required to cut a piece of wood into 20 sections? (You can only cut one piece of wood into two at a time.)