Hello! This week, I’ll be explaining how you can avoid a very tricky data sufficiency trap that’s often on the GMAT! I’ll be referring to the data sufficiency answer choices in this problem, so if you need a refresher on what those are, you can find them here. As always, leave us any questions or […]
Those of us who work in GMAT test prep often hear students say things such as, “I really understand the math on the GMAT, but I just make a bunch of silly mistakes” or, “Careless mistakes are my biggest problem on the GMAT Quant: how can I make fewer of them?” Let’s think about this. […]
Here are a few 800+ counting problems. Yes, that’s right, 800+, which means, as hard as (or possibly harder than) anything you will see on the GMAT. If you can do these, you are in great shape! 1) How many four digit numbers have no repeat digits, do not contain zero, and have a sum […]
Here are four GMAT Data Sufficiency questions involving inequalities. Full solutions will come at the end of this article. The arithmetic of equations: a review First of all, let’s review what should be more familiar — the arithmetic of equations. Suppose A = B and P = Q. The soundbyte is: you can combine […]
More formally, these are called “rational expressions” in mathematics — “rational” in the sense of “having do with a ratio”, as the word is used in the phrase “rational numbers“. These rational expression appear in some of the most challenging Quant problems on the GMAT. Here are a few practice questions. –2 –1 0 1 […]
Hello! Today, I talk through how to solve this tricky-looking geometry question. If you have any questions for us or suggestions for future video topics, let us know in the comments below. Enjoy!
First, here are eight practice problems exploring typical GMAT percent themes. 1. The original price of a suit is $200. The price increased 30%, and after this increase, the store published a 30% off coupon for a one-day sale. Given that the consumers who used the coupon on sale day were getting 30% off the […]
First, a couple questions to start: 1) A large research project was scheduled over the course of a 28-month period, and a budget of $84,000 was allotted for the course of the entire project. After seven months, the project had spent $19,800. Was the project at this point over budget or under budget, and by […]
Hi, everyone! This week’s video is one of my favorites, because it’s about Data Sufficiency, and it has an awesome flowchart: Here’s a screenshot of the flowchart (you should memorize it!):
First, a bank of eight practice problems 1) A certain zoo has mammal and reptiles and birds, and no other animals. The ratio of mammals to reptiles to birds is 11: 8:5. How many birds are in the zoo? Statement (1): there are twelve more mammals in the zoo than there are reptiles Statement (2): […]
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