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.
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