Complete GMAT Data Sufficiency Lesson | Avoiding Common Tricks and Traps

Learn how to avoid GMAT Data Sufficiency tricks and traps, find clues, use all the information available to you, and in the process, outperform people with equivalent or even superior Quant knowledge.

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TIMESTAMPS

00:00 Introduction
02:30 Question 1: Of the 66 people in a certain auditorium, at most 6 people have their birthdays in any one given month.
08:00 Question 1 solution
09:22 Question 2: Jack wants to use a circular rug on his rectangular office floor to cover two small circular stains
17:00 Question 2 solution
20:54 Question 3: if t and x are integers what is the value of x?
26:12 Question 3 solution
27:52 Question 4:Michael arranged all his books in a bookcase with 10 books on each shelf and no books left over.
34:52 Question 4 solution
35:44 Question 5: If the positive integer n is added to each of the integers 69, 94, and 121, what is the value of n?
40:42: Question 5 solution
44:26 Question 6: A craftsperson made 126 ornaments and put them all into boxes.
52:18 Question 6 solution
52:40 Question 7: If r and s are positive integers, is r/s an integer?
60:00 Question 7 solution

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Full question text

- Of the 66 people in a certain auditorium, at most 6 people have their birthdays in any one given month. Does at least one person in the auditorium have a birthday in January?

- Jack wants to use a circular rug on his rectangular office floor to cover two small circular stains, each less than π/100 square feet in area and each more than 3 feet from the nearest wall. Can the rug be placed to cover both stains?

- Michael arranged all his books in a bookcase with 10 books on each shelf and no books left over. After Michael acquired 10 additional books, he arranged all his books in a new bookcase with 12 books on each shelf and no books left over. How many books did Michael have before he acquired the 10 additional books?

- If the positive integer n is added to each of the integers 69, 94, and 121, what is the value of n?

- A craftsperson made 126 ornaments and put them all into boxes. If each box contained either 6 ornaments or 24 ornaments, how many of the boxes contained 24 ornaments?

- If r and s are positive integers, is r/s an integer?

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