tailieunhanh - Wiley publishing inc GMAT for dummies Episode 2 Part 7

Tham khảo tài liệu 'wiley publishing inc gmat for dummies episode 2 part 7', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 20 Explaining the Answers to Practice Test 2 333 28. A. To determine the number of 360-degree rotations once around that Tashi s wheel turned in the 50 meters you have to know the circumference of the circle in meters. Then fyou can divide 50 by the circumference to arrive at your answer. To determine the circumference you need to know the radius because C 2nr. The diameter is double the radius so statement 1 gives you enough information to determine the radius and solve the problem. The first statement is sufficient so the answer is either A or D. The initial question provides no information on total time so the number of rotations per minute doesn t help solve the problem. Statement 2 is insufficient so the answer can t be D. Choose A. 29. C. To solve this problem you need to know the mean and median of the set of numbers. Find the mean by applying the formula mean sum of values number of values 306 5 The median is the middle value for an odd number of values and the arithmetic mean of the I mn I two middle values for an even number of values. Order the values in the set from lowest to highest 0 1 3 4 10 12. Find the two middle values 3 and 4. Find their mean to get the median 3 4 2 After you know the mean and median subtract them to get the final answer 5 - . C is correct. 30. E. If this year s earnings are projected to be 125 percent greater than last year s earnings and last year s earnings were 10 million this year s earnings will be an additional 10 million and then some. Multiply last year s 10 million by 125 percent or 10 million X million Add million to 10 million to get million. Your answer is E. 31. C. The only information this problem gives you is that x y and z are real numbers which means that they could be just about any value you think of as a number. Knowing that x y and z have an average mean of 8 doesn t help you at all to determine what x equals. You d have to know the value of at least two of the .