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Bit of significant figure help needed!

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If I have an equation such as (making up random numbers):

Pressure 1: 1156KPa
Pressure 2: 2734KPa
Temperature 1: 25 degrees Celsius (25 + 273 = 298K)
Temperature 2: Unknown

So my answer is always to the least amount of significant figures; is my answer to 2 sig figs (because of 25 degrees Celsius) or do I use the Kelvin version (298 has 3 sig figs)?

Short version: 2 sig figs or 3?
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