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.

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 »

Last year Joe grew 1 inch and Sally grew 200 percent more than Joe grew. How many inches did Sally grow last year?

Last year Joe grew 1 inch and Sally grew 200 percent more than Joe grew. How many inches did Sally grow last year? A. 0 B. 1 C. 2 D. 3 E. 4 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

Last year Joe grew 1 inch and Sally grew 200 percent more than Joe grew. How many inches did Sally grow last year? Read the Full Article »

Working simultaneously at their respective constant rates, Machines A and B produce 800 nails in x hours. Working alone at its constant rate, Machine A produces 800 nails in y hours. In terms of x and y, how many hours does it take Machine B, working alone at its constant rate, to produce 800 nails?

Working simultaneously at their respective constant rates, Machines A and B produce 800 nails in x hours. Working alone at its constant rate, Machine A produces 800 nails in y hours. In terms of x and y, how many hours does it take Machine B, working alone at its constant rate, to produce 800 nails? A. x/(x+y) B. y/(x+y) C. xy/(z+y) D. xy/(x-y) E. zy/(y-x) Correct Answer: E Full

Working simultaneously at their respective constant rates, Machines A and B produce 800 nails in x hours. Working alone at its constant rate, Machine A produces 800 nails in y hours. In terms of x and y, how many hours does it take Machine B, working alone at its constant rate, to produce 800 nails? Read the Full Article »

Three-fourths of the area of a rectangular lawn 30 feet wide by 40 feet long is to be enclosed by a rectangular fence. If the enclosure has full width and reduced length rather than full length and reduced width, how much less fence will be needed?

Three-fourths of the area of a rectangular lawn 30 feet wide by 40 feet long is to be enclosed by a rectangular fence. If the enclosure has full width and reduced length rather than full length and reduced width, how much less fence will be needed? A. 2(1/2) B. 5 C. 10 D. 15 E.

Three-fourths of the area of a rectangular lawn 30 feet wide by 40 feet long is to be enclosed by a rectangular fence. If the enclosure has full width and reduced length rather than full length and reduced width, how much less fence will be needed? Read the Full Article »

Tanks A and B are each in the shape of a right circular cylinder. The interior of Tank A has a height of 10 meters and a circumference of 8 meters, and the interior of Tank B has a height of 8 meters and a circumference of 10 meters. The capacity of Tank A is what percent of the capacity of Tank B?

Tanks A and B are each in the shape of a right circular cylinder. The interior of Tank A has a height of 10 meters and a circumference of 8 meters, and the interior of Tank B has a height of 8 meters and a circumference of 10 meters. The capacity of Tank A is

Tanks A and B are each in the shape of a right circular cylinder. The interior of Tank A has a height of 10 meters and a circumference of 8 meters, and the interior of Tank B has a height of 8 meters and a circumference of 10 meters. The capacity of Tank A is what percent of the capacity of Tank B? Read the Full Article »