My question is as follows.

Question

One day Ottawa experienced a record low temperature of-29°C. The median temperature of Vancouver, Ottawa, and Halifax was -12. What might the temperatures have been in Vancouver and Halifax?

Answer 1

median = -12, Ottawa = -29

Vancouver and Halifax would be -12 and anywhere from -11.999... to +infinity degrees Celsius

IF you really mean the mean & median =-12, then Vancouver & Halifax were -12 and +5

Americans relate more to F than C degrees

F = 1.8C +32

F = 1.8(5)+32 = 9+32=41 F = Not freezing, but very chilly

F = 1.8(-12) +32 = -21.6+32 = 10.4 F = subfreezing, frostbite weather

F = 1.8(-29)+32 = -46.2+32 = -14.2 F = subfreezing & subzero F, main reason half of Canada goes on vacation south of the border during winter time