APPROACH #1: Number sense
If x < 5 (as we're told), then x - 5 < 0 (since we're subtracting 5 from a number that's less than 5)
Conversely, x < 5 , then 5 - x > 0 (since we're taking 5 and subtracting a number that's less than 5)

If x - 5 is negative, and 5 - x is positive, the correct answer is B.

APPROACH #2: Matching operations
Given:
Quantity A: x - 5
Quantity B: 5 - x

Add x to both quantities:
Quantity A: 2x - 5
Quantity B: 5

Add 5 to both quantities:
Quantity A: 2x
Quantity B: 10

Divide both quantities by 2 to get:
Quantity A: x
Quantity B: 5

Since we're told 0 < x < 5, Quantity B must be greater.
Answer: B

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