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.

How many different prime numbers are factors of the positive integer n?

How many different prime numbers are factors of the positive integer n? (1) Four different prime numbers are factors of 2n. (2) Four different prime numbers are factors of n^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 […]

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The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of

The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged? Read the Full Article »

GMAT Reading Comprehension Challenge

Economist GMAT Reading Comprehension Challenge #30

Economist GMAT Reading Comprehension Challenge #30 Welcome to the Economist GMAT Reading Comprehension! First time? Here are suggestions for approaching the article. Economist Article Economist Article: “Wirecard’s scandal shows the benefits of short-sellers” Link: https://www.economist.com/leaders/2020/06/24/wirecards-scandal-shows-the-benefits-of-short-sellers Paragraph Summaries Germans consumed by tech envy of America… Wirecard is a German financial tech company, among one of the

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GMAT Reading Comprehension Challenge

Economist GMAT Reading Comprehension Challenge #27

Economist GMAT Reading Comprehension Challenge #27 Welcome back to the Economist Reading Comprehension Challenges! Just getting started? Here are some reading strategies on the EGRCC home page. Economist Article Economist Article: Walmart ekes out an edge in groceries during the pandemic Link: https://www.economist.com/business/2020/05/23/walmart-ekes-out-an-edge-in-groceries-during-the-pandemic Paragraph Summaries As COVID-19 began… Amazon’s pandemic-related expenses are eating away at

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GMAT Reading Comprehension Challenge

Economist GMAT Reading Comprehension Challenge #29

Economist GMAT Reading Comprehension Challenge #29 Welcome to the Economist GMAT Reading Comprehension Challenges! If this is your first article here are instructions for approaching the reading. Economist Article Economist Article: “The potential and the pitfalls of medical AI” Link: https://www.economist.com/technology-quarterly/2020/06/11/the-potential-and-the-pitfalls-of-medical-ai Paragraph Summaries The books strewn around… Introduction to Dr. Keane, a medical practitioner who

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