Answer :

jcherry99
A quick way (approximate) to do this is to subtract 30 and divide by 2. That give 27 which means that the answer should be C.

Now to do it properly
C = 5/9 (F - 32)
C = 5/9 (86 - 32)
C = 5/9 (54)
C = 30 exactly. 
penfila11Pen
Your answer will be 
C. 30°C

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