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In a constant volume gas thermometer, the pressure of the gas varies in proportion to the temperature of the gas. The temperature varies linearly wrt to the pressure and vice versa.

 So the formula is:    T = (P - P₀) / (P₁₀₀ - P₀)  * 100 ⁰C
     Where T is the temperature at pressure P.
                P₀ is pressure at T₀ = 0⁰ C
             and P₁₀₀ is pressure at T₁₀₀ = 100⁰C
   T = (35.0 - 28.6) / (36.6 - 28.6)  * 100 ⁰C 
       = 80⁰ C

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