Answer and Explanation to Monday's Sample GMAT Question

Here is the answer and explanation to yesterday's sample GMAT question (from Integrated Learning.)

Answer: A

Explanation:
To solve this question quickly, we need to know how to sum consecutive numbers quickly.

The process, as we teach all our students, is the following:

1. Find the middle number by averaging the endpoints:

(37 + 5)/2 = 21

2. Find the number of numbers. When we are including both the first and last number, subtract the endpoints and add 1:

(37 – 5) + 1 = 33

3. Multiply:

21x33 = 693

Now find the prime factors of 693. You will see that they are 3, 3, 7, 11.

Thus, the lowest prime factor is 3.

Additional Resources:

• Integrated Learning on Facebook
• More GMAT Practice Questions
• Free GMAT Prep Course - Math