We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Up to 90+ points GMAT score improvement guarantee

The best guarantee you’ll find

Our Premium and Ultimate plans guarantee up to 90+ points score increase or your money back.

Master each section of the test

Comprehensive GMAT prep

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Schedule-free studying

Learn on the go

Study whenever and wherever you want with our iOS and Android mobile apps.

The most effective way to study

Personalized GMAT prep, just for you!

Correct. [[snippet]] For example, 200 is divisible by 5 but not by 3 since the sum of its digits ($$2+0+0$$) is not divisible by 3. The next closest multiple of 5 is 195, which satisfies the conditions for 3 and 5 and is thus divisible by 15. The least multiple is thus -195, and the greatest is 195. To count multiples, subtract the extremes, divide by 15, and don't forget to add 1: >$$\displaystyle \frac{195-(-195)}{15} + 1 = \frac{390}{15} + 1 = 27$$.