## Articles by GMAT Prep Now

#### Average Speed Questions

In this video, we examine how to find the average speed of a trip when that trip consists of two or more parts during which the speeds differ. Read More

#### GMAT Algebra: How Many Variables Should You Use?

Consider the following word problem: A certain store sells apples for $0.75 each and bananas for $0.50 each. Lila bought 20 pieces of fruit consisting of apples and bananas only. If the total cost of her purchase was … Read More

#### Testing Cases in Even/Odd Questions

Consider the following data sufficiency question: If and are integers, is even? 1) is odd 2) is odd For statement 1, one option is to factor the expression and apply some properties of even and odd integers (for a … Read More

#### Counting the Divisors of Large Numbers

If we want to determine the number of positive divisors of a small number like 24, we can easily list {1, 2, 3, 4, 6, 8, 12, 24} and count the divisors to see that we have 8 altogether. However, this listing and counting … Read More

#### Properties of Consecutive Integers

Questions involving consecutive integers are popular on the GMAT. In fact, there’s a good chance you’ll encounter a consecutive integers question on test day. This video highlights some important properties you … Read More

#### GMAT Expressions: Substitutions That Simplify

On the GMAT, you’ll sometimes encounter tough mathematical expressions. Consider the following Data Sufficiency question: What is the value of ? Statement 1: Statement 2: Let’s begin with statement 1: Some … Read More

#### Learning from Your Practice Tests

It’s easy to get trapped in an endless cycle of taking practice tests without stopping to carefully consider their results. Sure, taking practice tests will help you become more familiar with the GMAT as a whole, … Read More

#### General Approach to Sentence Correction Questions

Sentence Correction questions can be challenging, so it’s important to approach each of them with a general strategy. Jumping right into reading the answer choices isn’t the smartest way to proceed. Test-takers … Read More

#### Engaging with GMAT Reading Comprehension Passages

Anyone planning to take the GMAT will sit through a Verbal Reasoning section, which includes questions on lengthy Reading Comprehension passages. These questions involve tasks related to the main idea, structure, … Read More

#### Solving Average Speed Problems

Average speed problems are common on the GMAT. These questions can be tricky if you haven’t practiced solving them, because the most obvious answer choice is a trap. To see why, try the following problem: Joe drives … Read More

#### Variables in the Answer Choices, Part II: Pitfalls with the Input-Output Approach

In the last article, we learned the algebraic approach and the input-output approach for solving questions with variables in the answer choices (VIACs). In that article, I ended by saying that, while the input-output … Read More

#### Substandard GMAT Questions

Just like your grandmother probably told you, the secret to getting good at anything—golf, piano, quantum physics—is to practice, practice, practice. It’s certainly true for success on the GMAT. Once you learn the … Read More

#### Variables in the Answer Choices – Part I: Two Approaches

In this article, we’ll examine two different approaches you can take when solving questions with variables in the answer choices (also known as VIACs). To begin, please try the following question: Townville has X … Read More

#### Listing Possible Values in a Remainder Question

To set up this article, please try solving the following question. Here is the practice problem: x and y are positive integers. When x is divided by 11, the remainder is 5, and when x is divided by 34, the … Read More