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.

Machines X and Y work at their respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone?

Machines X and Y work at their respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone? (1) Machines X and Y, working together, fill a production order of this size in two-thirds the time […]

Machines X and Y work at their respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone? Read the Full Article »

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

Economist GMAT Reading Comprehension Challenge #30 Read the Full Article »

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

Economist GMAT Reading Comprehension Challenge #27 Read the Full Article »