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Andrew Geller

Andrew Geller is a top GMAT tutor based out of New York City. Throughout his career he has successfully taught people from many different backgrounds, countries, and starting scores.

Two dice are tossed once. The probability of getting an even number at the first die or a total of 8 is

Two dice are tossed once. The probability of getting an even number at the first die or a total of 8 is A. 1/36 B. 3/36 C. 11/36 D. 20/36 E. 23/36 Correct Answer: D Full explanation coming soon. Send us a note if you’d like this added to the express queue! You’ll find tons

Two dice are tossed once. The probability of getting an even number at the first die or a total of 8 is Read the Full Article »

A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd?

A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd? A. 1/4 B. 3/8 C. 1/2 D. 5/8 E. 3/4 Correct

A box contains 100 balls, numbered from 1 to 100. If three balls are selected at random and with replacement from the box, what is the probability that the sum of the three numbers on the balls selected from the box will be odd? Read the Full Article »

A rope 40 feet long is cut into two pieces. If one piece is 18 feet longer than the other, what is the length, in feet, of the shorter piece?

A rope 40 feet long is cut into two pieces. If one piece is 18 feet longer than the other, what is the length, in feet, of the shorter piece? (A) 9 (B) 11 (C) 18 (D) 22 (E) 29 Correct Answer: B You’ll find tons of practice questions, explanations for GMAT Official Guide questions,

A rope 40 feet long is cut into two pieces. If one piece is 18 feet longer than the other, what is the length, in feet, of the shorter piece? Read the Full Article »

In the xy-plane shown, the shaded region consists of all points that lie above the graph of y=x^2 – 4x and below the the x-axis. Does the point (a,b) (not shown) lie in the shaded region if b<0?

In the xy-plane shown, the shaded region consists of all points that lie above the graph of y=x^2 – 4x and below the the x-axis. Does the point (a,b) (not shown) lie in the shaded region if b<0? (1) 0 < a < 4 (2) a^2 – 4a < b A. Statement (1) ALONE is

In the xy-plane shown, the shaded region consists of all points that lie above the graph of y=x^2 – 4x and below the the x-axis. Does the point (a,b) (not shown) lie in the shaded region if b<0? Read the Full Article »

When the figure above is cut along the solid lines, folded along the dashed lines, and taped along the solid lines, the result is a model of a geometric solid. This geometric solid consists of 2 pyramids each with a square base that they share. What is the sum of number of edges and number of faces of this geometric solid?

When the figure above is cut along the solid lines, folded along the dashed lines, and taped along the solid lines, the result is a model of a geometric solid. This geometric solid consists of 2 pyramids each with a square base that they share. What is the sum of number of edges and number

When the figure above is cut along the solid lines, folded along the dashed lines, and taped along the solid lines, the result is a model of a geometric solid. This geometric solid consists of 2 pyramids each with a square base that they share. What is the sum of number of edges and number of faces of this geometric solid? Read the Full Article »