Comprehension Passage
Directions: The given line graph shows the percentage of marks secured by a student in first 6 semesters of his engineering, while the result for 7th and 8th semester is awaited. The maximum marks in each semester is 600. Study the line graph and answer the questions that follow.
What is the ratio of the sum and the difference between the marks obtained by the student in 3rd and 4th semesters?
1
7 ∶ 1
2
19 ∶ 1
3
23 ∶ 1
4
31 ∶ 1