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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.

Working simultaneously and independently at an identical constant rate, four machines of a certain type can produce a total of x units of product P in 6 days. How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product P in 4 days?

Working simultaneously and independently at an identical constant rate, four machines of a certain type can produce a total of x units of product P in 6 days. How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product P in 4 days? A. 24 B. 18 C. 16 D.

Working simultaneously and independently at an identical constant rate, four machines of a certain type can produce a total of x units of product P in 6 days. How many of these machines, working simultaneously and independently at this constant rate, can produce a total of 3x units of product P in 4 days? Read the Full Article »

The table shows the amount budgeted and the amount spent for each of three accounts in a certain company. For which of these accounts did the amount spent differ from the amount budgeted by more than 6 percent of the amount budgeted?

The table shows the amount budgeted and the amount spent for each of three accounts in a certain company. For which of these accounts did the amount spent differ from the amount budgeted by more than 6 percent of the amount budgeted? A. Payroll only B. Taxes only C. Insurance only D. Payroll and Insurance E.

The table shows the amount budgeted and the amount spent for each of three accounts in a certain company. For which of these accounts did the amount spent differ from the amount budgeted by more than 6 percent of the amount budgeted? Read the Full Article »

If mn ≠ 0 and 25 percent of n equals 37(1/2) percent of m, what is the value of 12n/m?

If mn ≠ 0 and 25 percent of n equals 37(1/2) percent of m, what is the value of 12n/m? A. 18 B. 32/3 C. 8 D. 3 E. 9/8 Correct Answer: A Full explanation coming soon. Send us a note if you’d like this added to the express queue! You’ll find tons of practice questions, explanations for GMAT Official Guide questions, and

If mn ≠ 0 and 25 percent of n equals 37(1/2) percent of m, what is the value of 12n/m? Read the Full Article »

If 1/3 of the total number of marbles in the three bags listed in the table above are blue, how many marbles are there in bag Q?

  If 1/3 of the total number of marbles in the three bags listed in the table above are blue, how many marbles are there in bag Q? A. 5 B. 9 C. 12 D. 23 E. 46 Correct Answer: B Full explanation coming soon. Send us a note if you’d like this added to the express queue!

If 1/3 of the total number of marbles in the three bags listed in the table above are blue, how many marbles are there in bag Q? Read the Full Article »