We know the relationship:
Temperature in Kelvin = Temperature in °C + 273
Substitute the given value in the equation and then calculate the other unknown value.
To change a temperature on the Kelvin scale to the Celsius scale we have to subtract 273 from the given temperature
a) 293 K = (293 – 273)
= 20 °C
b) 470 K = (470 – 273)
= 197 °C