Knewton GMAT Prep

GMAT Videos—Question & Answer Video Guides

Welcome to this sample of our vast collection of GMAT Question Video Guides created by the expert teachers at Knewton GMAT!

These videos take you through a handful of extra-tough GMAT questions you’ll find in the Knewton GMAT course. Click on one of the boxes to try a question and open a video explanation you can watch once you have your answer.

Data Sufficiency – Graph Intersect

If f(x) = ax2 + bx + c, and a does not equal 0, at what point does the graph of the function f(x) intersect the y-axis?

  1. The graph of f(x) intersects the x-axis exactly twice, at (-6, 0) and (-2, 0)
  2. a = 2

(A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient.

Data Sufficiency – Positive Integer

Is the positive integer n divisible by 6?

  1. n2/180 is an integer
  2. - 144/n2

(A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
(B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
(C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
(D) EACH statement ALONE is sufficient.
(E) Statements (1) and (2) TOGETHER are NOT sufficient.

Problem Solving – Employee Survey

In a survey of 348 employees, 104 of them are uninsured, 54 work part time, and 12.5 percent of employees who are uninsured work part time. If a person is to be randomly selected from those surveyed, what is the probability that the person will neither work part time nor be uninsured?

(A) 7/12
(B) 8/41
(C) 91/348
(D) 1/8
(E) 41/91

Problem Solving – Roman Numerals

If x < 0, y is nonzero, and 1 > 1 – x/y > 0, which of the following must be true?

  1. y > 0
  2. x/y > 0
  3. y2 – x2 > 0

(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I, II, and III

Sentence Correction – Franklin Roosevelt

Because he had not experienced any symptoms until adulthood and was affected by facial paralysis early on in the course of his illness, Franklin Delano Roosevelt, whose death was originally attributed to complications arising from polio, may actually have suffered from symptoms related to Guillain-Barre syndrome.

(A) Because he had not experienced any symptoms until adulthood and was affected by facial paralysis early on in the course of his illness
(B) Since he has experienced his symptoms in adulthood and has been affected by facial paralysis early on in the course of his illness
(C) Early on in the course of his illness he experienced facial paralysis and having not experienced any symptoms until adulthood
(D) Because he had not experienced any symptoms until adulthood, he had been affected by facial paralysis early on in the course of his illness
(E) Since he did not experience any symptoms until adulthood and had been affected by facial paralysis early on in the course of his illness