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Well, hopefully you know how to get Kelvin. For example. 1 degrees Celsius to Kelvin is 274.15.   Celsius - Kelvin 273.15. Anyway, two other related equations would be  x Celsius + 273.15 =  y (Kelvin) and   Celsius - Kelvin = Add 273.15

If the temperature in Celsius is 23 degrees, it would be 296.15 Kelvin. 

300 Kelvin is greater than 25 Celsius. I got my answer because I know to get Celsius, you would add 273.15 to the celsius. 25 + 273.15 = 298.15. So 300 Kelvin is greater than 25 Degrees Celsius.

I hope this helps!!