Rowan Of the 190 bicycle stores in a certain region, 90 percent repair bicycles and 40 percent rent bicycles. If the integer n denotes the number of bicycle stores in the region that both repair and rent bicycles, which of the following indicates all possible values of n ? A. 38 ≤ n ≤ 76 B. … Read More
The table gives three factors to be considered when choosing an Internet service provider GMAT EA The table gives three factors to be considered when choosing an Internet service provider and the percent of the 1,200 respondents to a survey who cited that factor as important. If 30 percent of the respondents cited both “user-friendly” … Read More
The domain of the function f(x) = \frac(x-1)(x+1) is the set of all real numbers that are: Oof–that’s a huge chunk of code, which I had to put on here just so you could find it! Sorry–let’s try that one again in a way that actually makes some sense… The domain of the function f(x) … Read More
A certain identification code consists of 6 digits, each of which is chosen from 1, 2, …, 9. …The same digit can appear more than once. If the sum of the 1st and 3rd digits is the 5th digit, and the sum of the 2nd and 4th digits is the 6th digit, how many identification … Read More
If 3^x – 3^(x-3) = 2106, what is the value of x? This is a fairly tricky factoring question, but it goes back to one of the general factoring principles: always factor out the common term. Here’s where we start: In our case, the common term is 3^x. That leaves us with… …on the left … Read More
At a picnic there were 3 times as many adults GMAT SOLUTION This question is more complicated than it needs to be, but it is simply an issue of careful substitution. Look at it this way: we need the number of men in terms of x, which would imply that we get all of the … Read More
If the recommended weight w, in pounds, for a male… GMAT Data Sufficiency Question Here’s the question for you: If the recommended weight w, in pounds, for a male is given in terms of his height h, in inches, by the formula w = 4.5h − 154, how much greater is Eric’s recommended weight than … Read More
Last year the price per share of Company A’s stock… is a pretty frustrating little question. That’s because this GMAT question is extra-sneaky in its wording. Make sure that you’re being careful about what is what. I personally recommend writing down all of your values relative to the original value, perhaps in a table. Last … Read More
Here’s a simple solution to the classic “For a certain race, 3 teams were allowed to enter 3 members each” GMAT question. First, let’s look at the question text so you know what we’re talking about: For a certain race, 3 teams were allowed to enter 3 members each. A team earned 6 – n … Read More
GMAT Combinatorics: The Ultimate Guide to GMAT Factorials — the Three-Question Method If we don’t get the concept of Factorials straight, the rest of this–Permutations and Combinations, quite a lot of advanced GMAT fatoring, etc.–is never going to work. How to Think About GMAT Factorials in a Broad Sense The idea of a Factorial is … Read More