teal wrote:

Hi,

In D/S question stem sometimes we deal with variables that are sometimes numbers and sometimes integers. Integers can be both positive, negative or zero.

For numbers, I know for sure numbers can be zero or positive but can a number take a negative value.

Say x is a number can x be -0.2?

It seems that you need to brush up your fundamentals.

"x is a number ..." on the GMAT means that x is a real number. Real Numbers are integers, fractions and irrational numbers, so yes numbers can be negative. For example -2 is a negative number (negative integer).

For more check Number Theory chapter of Math Book:

math-number-theory-88376.htmlP.S. This is a general math question, so it should be posted in Main Math Forum, not in GMAT Club Tests subforum.
_________________

New to the Math Forum?

Please read this: All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:

GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:

PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.

What are GMAT Club Tests?

Extra-hard Quant Tests with Brilliant Analytics