GMAT Quantitative Review

3.0 Math Review

3.4 Word Problems

10. Data Interpretation

Occasionally a question or set of questions will be based on data provided in a table or graph. Some examples of tables and graphs are given below.

Example 1:

Population by Age Group
(in thousands)

Age

Population

17 years and under

63,376

18−44 years

86,738

45−64 years

43,845

65 years and over

24,054

How many people are 44 years old or younger?

Solution: The figures in the table are given in thousands. The answer in thousands can be obtained by adding 63,376 thousand and 86,738 thousand. The result is 150,114 thousand, which is 150,114,000.

Example 2:

AVERAGE TEMPERATURE AND PRECIPITATION IN CITY X

image

What are the average temperature and precipitation in City X during April?

Solution: Note that the scale on the left applies to the temperature line graph and the one on the right applies to the precipitation line graph. According to the graph, during April the average temperature is approximately image Celsius and the average precipitation is approximately 8 centimeters.

Example 3:

DISTRIBUTION OF AL’S WEEKLY NET SALARY

image

Al’s weekly net salary is $350. To how many of the categories listed was at least $80 of Al’s weekly net salary allocated?

Solution: In the circle graph, the relative sizes of the sectors are proportional to their corresponding values and the sum of the percents given is 100%. Note that image is approximately 23%, so at least $80 was allocated to each of 2 categories—Rent and Utilities, and Savings—since their allocations are each greater than 23%.