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Verified answer
C/15 = 100/200C = 100 .15 : 200
C = 7,5
Td X= 180°X
Tb C= 0°C
Td C= 100°C
X= 15°X
Td X - X Td C - C
----------------- = ---------------------
Td X - Tb X Td C - Tb C
180 - 15 100 - C
--------------- = ----------------
180 - (-20) 100 - 0
165 100 - C
------ = -----------
200 100
200(100 - C) = 165 × 100
20.000 - 200C = 16.500
200C = 20.000 - 16.500
200C = 3500
C= 35/2
C= 17,5°C
keterangan :
X= termometer X
C= termometer celcius
Tb= titik beku
Td= titik didih