SAT Intensive Drill – Luyện Tập Nâng Cao Chuyên Sâu

 Correct Answer: B

Explanation: To solve this problem, we set up equations based on the given information. Let's denote the length of the first part as x cm, the length of the second part as x+4 cm (since it's 4 cm longer than the first part), and the length of the third part as  x cm, reflecting the 3:2 ratio between the first and last parts. Given the total length of the line segment is 100 cm, we write the equation: x+(x+4)+x=100. Solving this equation gives us x=36, which allows us to determine the lengths of all three parts: the first part is 36 cm, the second part is 40 cm, and the third part is 24 cm. Among these, the longest part of the line segment is the second part, which measures 40 cm.