7. Marisol has 5 × as many books as Jerry. Jerry has 15 books. How many books does Marisol have?
Answer: C
Marisol has 75 books.
Marisol has 5 times as many books as Jerry, who has 15 books. Therefore, to find the number of books Marisol has, we multiply Jerry's books by 5, resulting in 75 books.
A) 10
This option is incorrect. If Marisol had 10 books, it would imply that Jerry has only 2 books, which contradicts the information given that Jerry has 15 books.
B) 20
This option is also incorrect. If Marisol had 20 books, it would suggest that Jerry has only 4 books, which does not align with the fact that Jerry has 15 books.
C) 75
This option is correct. Since Jerry has 15 books, multiplying this by 5 gives Marisol a total of 75 books, which matches the relationship stated in the question.
D) 225
This option is incorrect. If Marisol had 225 books, it would imply that Jerry has 45 books, which again contradicts the established condition that Jerry has 15 books.
Conclusion
The correct answer is 75 books, as it accurately reflects the multiplication of Jerry's total by 5, in accordance with the problem's requirements. All other options fail because they miscalculate the relationship between the number of books Jerry and Marisol possess.