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GMAT Focus Practice Exam Question Review with Complete Verified Answers
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GMAT Focus Practice Exam QuestionReview with Complete Verified Answers
Of the 400 employees in a certain office, 260 have been given a watch and 80 have been give a cell
phone. If the number of the employees have been given both a watch and a cell phone is 1/2 the
number who have been given neither a watch nor a cell phone. How many employees have been give a
watch but not a cell phone?A. 90B. 170C. 180D. 200E. 220 - ✔✔#W + #C - #W&C + Neither =
Total260 + 80 - (1/2)Neither + Neither = 400(1/2)Neither = 60Neither = 120#W&C = (1/2)120 =
60#W&NC = #W - #W&C = 260 - 60 = 200Therefore, 200 employees have been given a watch but not a
cell phone.Answer:
D
In a set of 5 measurements with an average (arithmetic mean) of 60, one of the measurements is found
to be incorrect. If this measurement is replaced by its correct value of 80, then the average of the
resulting set is 70. What is the value of the incorrect measurement?A. 10B. 20C. 25D. 30E. 50 -
✔✔average = sum of terms/number of termsnumber of terms = 5incorrect average = 60sum of terms
with one incorrect measurement = 5(60) = 300If x is the incorrect measurement, we have:sum of terms
with correct measurements = 300 - x + 80 = 380 - xSince the correct average is 70, we have:(380 - x)/5 =
70380 - x = 350x = 30Answer: D
The Chabberton Post-Gazette reported that the overall volume of retail sales in Chabberton was lower
last year than it was the year before. The Post-Gazette based that conclusion on a survey of all retail
stores that were in business in Chabberton throughout both of those years: these stores, taken
together, had a smaller sales volume last year than the year before.Which of the following, if true, casts
the most serious doubt on the Post-Gazette's conclusion?A. Last year several new retail stores opened in
Chabberton, offering high quality merchandise at competitive prices.B. Many Chabberton residents do
most of their shopping at stores in other towns in the vicinity of Chabberton.C. Most of the Chabberton
stores that the survey covered advertise regularly in the Chabberton Post-Gazette.D. A separate survey
of manufacturing businesses in Chabberton shows that they did a greater volume of business last year
than t - ✔✔a survey of all retail stores that were in business in Chabberton throughout both of those
years: these stores, taken together, had a smaller sales volume last year than the year before
This information seems to support the conclusion, but one thing we may notice is that the sample used
to support the conclusion is limited. It includes only stores "in business in Chabberton throughout both
of those years." What about other stores?
Let's now go to the answer choices.
, A. Last year several new retail stores opened in Chabberton, offering high quality merchandise at
competitive prices.
This choice seems to cast doubt on the conclusion that "the overall volume of retail sales in Chabberton
was lower last year than it was the year before." After all, while stores that were "in business in
Chabberton throughout both of those years" may have seen declines in sales, the sales at these new
stores could have added to "overall sales."
So, given what this choice says, "overall volume of sales" last year may have been similar to or
greater than, rather than smaller than, the volume the year before.
Thus, this choice provides a clear reason to doubt the conclusion.
Keep this choice.
Indeed, to remarkably high precision, the human eye is most sensitive to the exact frequency in the
yellow part of the spectrum at which the Sun is the brightest.
Which of the following most accurately describes the purpose of the highlighted sentence in relation to
the passage as a whole?A. To indicate the author's surprise at the manner in which human eyes have
developed in relation to the visible spectrum of lightB. To illustrate that the correspondence between
human eyes' sensitivity and the frequencies of light comprising the visible spectrum is not merely
coincidentalC. To assert that human eyes are more finely tuned to a particular part of the visible
spectrum of light than are those of some other organisms on EarthD. To explain why the gases that
comprise Earth's atmosphere do not absorb the frequencies of light that the Sun emits most
abundantlyE. To support the claim that the Sun is an average star w - ✔✔1. The main purpose of the
passage is to
We can bring the main purpose of the passage into focus by considering the important points
and structure of the passage.
The passage begins by presenting a general fact about light: "Light exists on a spectrum of frequencies
extending from gamma rays at the highest frequencies to radio waves at the lowest."
It then uses the contrast marker "though" to present a contrasting point about human eyes: "human
eyes are sensitive to only a narrow range of frequencies in the middle known as the visible spectrum."
Then, it finishes the first paragraph by bringing up something that "one might wonder": "Given that
there are so many frequencies of light, one might wonder why our eyes didn't evolve to be sensitive to
more frequencies."
Then, the second and third paragraphs explain why "we see the frequencies we do."
Finally, the fourth paragraph explains why even "living beings on other planets" do not likely see
at frequencies very different from those at which we see.
With these important points in mind, we can go to the answer choices.
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