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Y : C
= 90 : 100
= 9 : 10
45 Y = ...C
= 10/9 . 45 - 30
= 50 - 30
= 20 C
[100 dan 0 berasal dari titik tetap atas dan bawah celcius.]
°Y : °C = 90 : 100
= 9 :10
°C= 10/9 x 45
°C= 50°