- A Let b = Bob’s weight and j = Jack’s weight. Use these variables to create the
equation b + j = 50. If Bob weighs more than Jack, then Bob’s weight must
account for more than half of their sum. Algebraically,
b >^502
b > 25
Thus Quantity A is greater. - B Let j = the number of Jupiter bars sold and b = the number of Big Slugger
bars sold. The revenue for the Jupiter bars is 2j and the revenue for the Big
Slugger bars is 1b. Since the total revenue on the two bars is $30, it follows that
2 j + b = 30. To maximize b, minimize j. Since the retailer sold both candy bars,
the minimum value for j is 1. Thus 2(1) + b = 30 → b = 28. The maximum for b
is 28. Quantity B is greater. - D The given information provides no relationship between Jack’s age and
Tanya’s age. - D Let s = the price of a sedan and t = the price of a truck. Thus s + 3,000 =
2 t. You are given one relationship between two variables. Without additional
information, you cannot determine the relationship between the variables. - C Let s = the price of each stereo and m = the price of each MP3 player. The
total price of the three stereos is thus 3s, and the total price of each MP3 player
is thus 2m. Since the total prices are equal, 3s = 2m. Manipulate to solve for s/m:
3 s = 2m
Divide both sides by 3: ↓
s = (^23 )m
Divide both sides by m: ↓
(^) ms = (^23 )
The two quantities are equal.
Statistics
Statistics refers to the properties of a set of data. For the purposes of the GRE, you
can think of data as numerical pieces of information. For example, the number of
students in a class is a data point, as is the average grade for a class, or the range of
scores in a class. Though statistics is a broad field within mathematics, on the GRE,
you will be expected to understand the following statistical concepts:■ Mean
■ Median
■ Mode
■ Range
■ Standard deviation326 PART 4 ■ MATH REVIEW04-GRE-Test-2018_313-462.indd 326 12/05/17 12:03 pm