| Data Sufficiency Butler: October 2025 |
| October 17 | DS 1 | DS 2 |
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DS 1 The number of hardcover books at bookstore X is 67.5% of all the books at the store, while the number of hardcover books at bookstore Y is 66.9% of all the books in that store. How many hardcover books are at bookstore Y?
(1) There is the same number of books at both stores.
(2) There are 20,000 more hardcover books at bookstore X than there are at bookstore Y.
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DS 2 Machine A, machine B, and machine C, working together at their respective constant rates, can complete a certain job in 24 hours. How many hours would it take machine A, working alone at its constant rate, to complete the same job?
(1) Machines B and C, working together at their respective constant rates, can complete the job in 36 hours.
(2) Machines A and C, working together at their respective constant rates, can complete the job in 48 hours.