-1:(-6)

Possible interpretations:

• Division: -1 ÷ (-6) = 1/6.
• Ratio: -1:(-6) means the ratio of -1 to -6; since both are negative, this simplifies to 1:6 (equivalently 1/6).

If you need a single answer, the simplest ratio form is 1:6. If you’re asked for a decimal, it’s 0.1666… (1/6).