Final answer:
To determine Marcos' weekly reading rate, divide the number of books he reads by the number of weeks. Marcos reads 2 books in 1 week.
Step-by-step explanation:
To find out how many books Marcos reads in 1 week, we need to determine the rate at which he reads per week. Given that Marcos reads 3.5 books in 1.75 weeks, we can divide the number of books by the number of weeks to find the weekly reading rate:
Books per week = Total books read ÷ Total weeks
Books per week = 3.5 books ÷ 1.75 weeks
Books per week = 2 books
Therefore, Marcos reads 2 books in 1 week.