GRE Math Lesson #1: How To Answer Questions Without Math
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Want to know how to answer GRE Quantitative questions without doing any math?
Full Transcript Below:
Welcome to Lesson 1 from GRE Math Lessons dot com! Hi, and welcome to GRE Math Lessons: the quick and effective way to beat the G-R-E Math Section.
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Welcome everyone, my name is Greg, and I’ll be your personal GRE Math Tutor. In today’s lesson, we’ll be looking at solving a math problem through rapid elimination. Remember, the GRE is timed. It’s our goal to solve the problems as quickly as possible without making any mistakes. One of the best ways to do this is by rapidly eliminating answers that we know are wrong.
Let’s take a look at a sample problem: “George, Ben, and Sarah want to buy a computer together. The computer costs $600. If Ben agrees to pay three times as much as George, and Sarah agrees to pay twice as much as George, how much must Ben pay?” At first glance, this question may sound pretty confusing, but with Rapid Elimination, we can quickly find the right answer!
Let’s take a quick look at our choices: 200, 300, 400, 500, and 600 dollars. Remember, we are trying to figure out how much Ben has to pay, and he has to pay three times as much as George. Whatever George pays, Sarah pays double that.
We can start by just picking the middle option: Ben paying$400. If this were the right answer, George would be paying approximately $153 and Sarah would be paying approximately double that, $266. Even though our numbers aren’t exact, we can still move forward.
At this point, we can clearly see that we’re well above the actual cost of the computer: $600. So, if this answer isn’t right, any answers above it also aren’t right. With less than a couple minutes of work, we’ve eliminated more than half of the possible answers. Even if we stopped right now, we’d have a 50% chance of picking the right answer, not bad!
Of course, we’re not going to stop there. Let’s try and plug in the first answer: two-hundred. If Ben is paying $200, George is paying approximately $66 and Sarah is paying double that, about $132. With some simple addition, we can see that we are still well below the $600 mark. We can now remove this from our possible list of answers!
Now, we don’t even need to plug in the last answer; we’ve already eliminated all of the other possible answers! We can select answer two, $300, and move on to the next problem.
Great! Now you know how to quickly answer challenging GRE questions with Rapid Elimination. In the next lesson, we’ll learn another GRE Math Tactic. If you want more help with these types of questions, be sure to get the free study guide PDF at GREMathLessons.com. The Lesson 1 Study Guide contains additional practice questions and answers.
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